Aegean dispute


The Aegean dispute is a set of interrelated controversies between Greece and Turkey over sovereignty and related rights in the region of the Aegean Sea. This set of conflicts has strongly affected Greek-Turkish relations since the 1970s, and has twice led to crises coming close to the outbreak of military hostilities, in 1987 and in early 1996. The issues in the Aegean fall into several categories:
One aspect of the dispute is the differing interpretations of the maritime law: Turkey has not signed up to the Convention on the Continental Shelf nor the superseding United Nations Convention on the Law of the Sea, both of which Greece has signed up to; as such, Turkey doesn't recognize a legal continental shelf and EEZ around the Greek islands.
Between 1998 and the early 2010s, the two countries came closer to overcoming the tensions through a series of diplomatic measures, particularly with a view to easing Turkey's accession to the European Union. However, differences over suitable diplomatic paths to a substantial solution remained unresolved, and as of 2020 tensions remain.

Maritime and aerial zones of influence

Several of the Aegean issues deal with the delimitation of both countries' zones of influence in the air and on the sea around their respective territories. These issues owe their virulence to a geographical peculiarity of the Aegean sea and its territories. While the mainland coasts of Greece and Turkey bordering the Aegean Sea on both sides represent roughly equal shares of its total coastline, the overwhelming number of the many Aegean islands belong to Greece. In particular, there is a chain of Greek islands lined up along the Turkish west coast, some of them in very close proximity to the mainland. Their existence blocks Turkey from extending any of its zones of influence beyond a few nautical miles off its coastline. As the breadth of maritime and areal zones of influence, such as the territorial waters and national airspace, are measured from the nearest territory of the state in question, including its islands, any possible extension of such zones would necessarily benefit Greece much more than Turkey proportionally.
According to a popular perception of these issues in the two countries, Turkey is concerned that Greece might be trying to extend its zones of influence to such a degree that it would turn the Aegean effectively into a "Greek lake". Conversely, Greece is concerned that Turkey might try to "occupy half of the Aegean", i.e. establish Turkish zones of influence towards the middle of the Aegean, beyond the chain of outlying Greek islands, turning these into a kind of exclave surrounded by Turkish waters, and thus cutting them off from their motherland.

Territorial waters

Territorial waters give the littoral state full control over air navigation in the airspace above, and partial control over shipping, although foreign ships are normally guaranteed innocent passage through them. The standard width of territorial waters that countries are customarily entitled to has steadily increased in the course of the 20th century: from initially at the beginning of the century, to, and currently. The current value has been enshrined in treaty law by the United Nations Convention on the Law of the Sea of 1982. In the Aegean the territorial waters claimed by both sides are still at 6 miles. The possibility of an extension to 12 miles has fuelled Turkish concerns over a possible disproportionate increase in Greek-controlled space. Turkey has refused to become a member of the convention and does not consider itself bound by it. Turkey considers the convention as res inter alios acta, i.e. a treaty that can only be binding to the signing parties but not to others. Greece, which is a party to the convention, has stated that it reserves the right to apply this rule and extend its waters to 12 miles at some point in the future, although it has never actually attempted to do so. It holds that the 12-mile rule is not only treaty law but also customary law, as per the wide consensus established among the international community. Against this, Turkey argues that the special geographical properties of the Aegean Sea make a strict application of the 12-mile rule in this case illicit in the interest of equity. Turkey has itself applied the customary 12-mile limit to its coasts outside the Aegean.
Tensions over the 12-mile question ran highest between the two countries in the early 1990s, when the Law of the Sea was going to come into force. On 9 June 1995, the Turkish parliament officially declared that unilateral action by Greece would constitute a casus belli, i.e. reason to go to war. This declaration has been condemned by Greece as a violation of the Charter of the United Nations, which forbids "the threat or use of force against the territorial integrity or political independence of any state".

National airspace

The national airspace is normally defined as the airspace covering a state's land territory and its adjacent territorial waters. National airspace gives the sovereign state a large degree of control over foreign air traffic. While civil aviation is normally allowed passage under international treaties, foreign military and other state aircraft do not have a right to free passage through another state's national airspace. The delimitation of national airspace claimed by Greece is unique, as it does not coincide with the boundary of the territorial waters. Greece claims of airspace, as opposed to currently 6 miles of territorial waters. Since 1974, Turkey has refused to acknowledge the validity of the outer 4-mile belt of airspace that extends beyond the Greek territorial waters. Turkey cites the statutes of the International Civil Aviation Organization of 1948, as containing a binding definition that both zones must coincide. Against this, Greece argues that:
The conflict over military flight activities has led to a practice of continuous tactical military provocations, with Turkish aircraft flying in the outer 4-mile zone of contentious airspace and Greek aircraft intercepting them. These encounters often lead to so-called "dog-fights", dangerous flight maneuvers that have repeatedly ended in casualties on both sides. In one instance in 1996, it has been alleged that a Turkish plane was accidentally shot down by a Greek one.

Continental shelf

In the context of the Aegean dispute, the term continental shelf refers to a littoral state's exclusive right to economic exploitation of resources on and under the sea-bed, for instance oil drilling, in an area adjacent to its territorial waters and extending into the High Seas. The width of the continental shelf is commonly defined for purposes of international law as not exceeding 200 nautical miles. Where the territories of two states lie closer opposite each other than double that distance, the division is made by the median line.
The concept of the continental shelf is closely connected to that of an exclusive economic zone, which refers to a littoral state's control over fishery and similar rights. Both concepts were developed in international law from the middle of the 20th century, and were codified in the United Nations Convention on the Law of the Sea in 1982.
The dispute between Turkey and Greece is to what degree the Greek islands off the Turkish coast should be taken into account for determining the Greek and Turkish economic zones. Turkey argues that the notion of "continental shelf", by its very definition, implies that distances should be measured from the continental mainland, claiming that the sea-bed of the Aegean geographically forms a natural prolongation of the Anatolian land mass. This would mean for Turkey to be entitled to economic zones up to the median line of the Aegean Greece, on the other hand, claims that all islands must be taken into account on an equal basis. This would mean that Greece would gain the economic rights to almost the whole of the Aegean.
In this matter, Greece has the UN Law of the Sea on its side, although the Convention restricts the application of this rule to islands of a notable size, as opposed to small uninhabitable islets and rocks. The precise delimitation of the economic zones is the only one of all the Aegean issues where Greece has officially acknowledged that Turkey has legitimate interests that might require some international process of arbitration or compromise between the two sides.
Tensions over the continental shelf were particularly high during the mid-1970s and again the late 1980s, when it was believed that the Aegean Sea might hold rich oil reserves. Turkey at that time conducted exploratory oceanographic research missions in parts of the disputed area. These were perceived as a dangerous provocation by Greece, which led to a buildup of mutual military threats in 1976 and again in 1987.

Turkey's "Blue Homeland" claims

On 2 September 2019, Turkey's President Recep Tayyip Erdoğan appeared in a photograph with a map that depicted nearly half of the Aegean Sea and an area up to the eastern coast of Crete as belonging to Turkey. The map was displayed during an official ceremony at the National Defense University in Istanbul and shows an area labelled as "Turkey's blue homeland" stretching up to the median line of the Aegean, enclosing the Greek islands in that part of the Aegean without any indication of the Greek territorial waters around them. The Greek side expressed its regret, with the Greek Foreign Minister Nikos Dendias stating that Turkey's tactics are "communication campaigns that cannot change international legitimacy, merely establishing Turkey's image as a perpetrator".

Lodging claims in UN

On 13 November 2019, Turkey submitted to the United Nations a series of claims to Exclusive Economic Zones in the Eastern Mediterranean that are in conflict with Greek claims to the same areas – including a sea zone extending west of the southeastern Aegean island of Rhodes and south of Crete. The Turkish claims were made in an official letter by Turkey's Permanent Representative to the UN Feridun Sinirlioglu, which reflect Ankara's notion of a "Blue Homeland". Greece condemned these claims as legally unfounded, incorrect and arbitrary, and an outright violation of Greece's sovereignty.

Turkey's view

Turkey holds the view, unlike most other relevant states, that no islands can have a full Exclusive Economic Zone and should only be entitled to a 12 nautical mile reduced EEZ or no EEZ at all rather than the usual 200 miles that Turkey and every other country are entitled to. In this context, Turkey, for the first time on December 1, 2019, claimed that the Greek island of Kastellorizo shouldn't have any EEZ at all, because, from the equity-based Turkish viewpoint, it is a small island immediately across the Turkish mainland, and isn't supposed to generate a maritime jurisdiction area four thousand times larger than its own surface. Furthermore, according to Turkey's Foreign Ministry, an EEZ has to be coextensive with the continental shelf, based on the relative lengths of adjacent coastlines and described any opposing views supporting the right of islands to their EEZ as "maximalist and uncompromising Greek and Greek Cypriot claims". On 20 January 2020, the Turkish President Erdogan challenged even the rights of Crete, Greece's largest island and 5th largest in the Mediterranean, stating that "They talk about a continental shelf around Crete. There is no continental shelf around the islands, there is no such thing, there, it is only sovereign waters."
Turkey's view, however, is a 'unique' interpretation not shared by any other country and not in accordance to the United Nations' Convention on the Law of the Sea treaty, ratified by 167 countries but not Turkey. Turkey has refused to ratify the UNCLOS, and argues that it is not bound by its provisions that award islands maritime zones. The UNCLOS, and particularly Article 121 clearly states that the islands can have exclusive economic zones and continental shelf just like every other land territory. The Ambassadors of the United States and Russia to Athens, Geoffrey Pyatt and Andrey Maslov respectively, while commenting on Turkey's view, stated that all the islands have the same rights to EEZ and continental shelf as the mainlands do. Also the then US Assistant Secretary of State for European and Eurasian Affairs, Aaron Wess Mitchell, criticized the Turkish view, stating that it "is a minority of one versus the rest of the world."

Turkey-GNA maritime agreement

On 28 November 2019, President Erdoğan signed a controversial Memorandum of Understanding in Istanbul with the Prime Minister of the Tripoli-based Government of National Accord of Libya, Fayez al-Sarraj, to demarcate maritime zones in the Eastern Mediterranean on an area between Turkey and Libya, appearing to "write Crete off the map entirely" in the words of Foreign Policy's Keith Johnson.
This agreement drew condemnation by Greece and the international community, including the rival Tobruk-based government led by the Libyan House of Representatives and Khalifa Haftar, the European Union, United States, Russia, Egypt, Cyprus, Malta, France, Germany, Italy, Serbia, Israel, Syria, Bahrein, Saudi Arabia and the Arab League, as a violation of the International Law of the Sea and the Skhirat Agreement. The Libyan House of Representatives consequently started a bid to suspend the GNA from the Arab League, but did not succeed. The United States stated that it was "provocative" and a threat to the stability of the region. Acting foreign minister Israel Katz announced Israel's opposition to the maritime border accord between Ankara and Tripoli, and confirmed that the deal was "illegal" according to the Israeli official position, while at the same time noting that Israel does not want a conflict with Turkey.

Further Developments

In response to these developments, the GNA Ambassador to Greece Mohamed Younis Menfi was summoned to the Greek Ministry of Foreign Affairs in Athens, where he was given an ultimatum of seven days, to disclose until 5 December the agreement his country signed with Turkey on maritime boundaries, or will be considered "persona non-grata" and be expelled from Greece. The authorities of the European Union also urged for the disclosure of the deal's details. Also, the Greek Prime Minister Kyriakos Mitsotakis met with the Turkish President on the sidelines of the 2019 London summit to discuss about it. Greek Foreign Minister Dendias revealed that, earlier this year, in September, his GNA counterpart, foreign minister Mohamed Taher Siala had reassured the Greek side that Libya would never sign any illegal agreements with Turkey that would violate the Greek sovereign rights.
On 6 December, the GNA Ambassador to Athens was expelled from Greece, prompting strong reactions in both the GNA and Turkey. Furthermore, the President of the Tobruk-based Libyan Parliament, Agila Saleh Issa Gwaider, who condemned and opposed the GNA-Turkey deal, was invited to Athens by the President of the Greek Parliament Konstantinos Tasoulas for talks.
Ankara asked for the agreement on maritime boundaries from the Government of National Accord in the Libyan Civil War, in exchange for Turkey's long-time support against the rival Tobruk-based House of Representatives.
It is believed that Turkey's President Recep Tayyip Erdogan is exploiting the weakness of the GNA headed by Fayez al-Sarraj to force it to sign "illegal" agreements which are a serious breach of international laws that disregards the lawful rights of other eastern Mediterranean countries. Through these exploitations, Turkey is trying to assert its regional power and its control of the Mediterranean sea, at the expense of the rights of the other Mediterranean nations and undermining the peace-making efforts to resolve the Libyan Civil War and the curb of migrant influx to Europe.
On 4 December 2019, the Turkish Minister of Energy and Natural Resources, Fatih Dönmez, announced Turkey's intentions to start awarding licences to drills for natural gas in Greek waters which Ankara claimed through the Turkey-GNA deal, once it is approved by the two countries' parliaments. The same day, Turkish President Erdogan stated that he is "ready" to start negotiations with Athens for the delimitation of maritime borders between Turkey and Greece, under the condition that the negotiations are based on Turkey's peculiar perception which is stripping the Greek islands of their sovereign rights, and is violating the UNCLOS treaty.
The intentions for drills in Greek waters, was confirmed by President Erdogan on a public broadcast of the Mavi Vatan map and the Turkey-GNA deal. On 5 December 2019, the Turkish Parliament ratified the contentious GNA-Turkey maritime borders deal, where it had a strong backing by four of Turkey's five major political parties - with the exception of the pro-Kurdish People's Democracy Party. The Libyan Parliament however blocked the ratification and rejected the deal unanimously, with the President of the Parliament, Aguila Saleh Issa, sending a letter to the United Nations declaring it as null and void. Even though the ratification by the Libyan Parliament failed, GNA deposited the maritime agreement to the United Nations on December 27, with Turkey following on March 2 of the next year. On 14 July 2020, it is revealed that five countries sent a joint note verbale to the UN Secretariat calling for the agreement to not be registered and accepted, noting that, per UN procedures, its ratification by the Libyan Parliament is a prerequisite.
Experts fear a destabilization of the East Mediterranean and NATO due to Turkey's aggressive moves and that an armed conflict between Turkey and Greece draws closer. On 9 December, the vessels of the Libyan Navy which are under the control of the Libyan National Army, announced that they received mandate to sink any Turkish research vessels or drillships that may attempt to conduct researches south of Crete, as part of the Turkey-GNA deal. In reaction, France signaled its intention to send French frigates and ships to the south of Crete, in coordination with Athens, and Italy sent the Italian frigate "Martinengo" to monitor, patrol and safeguard the sea around Cyprus, which has been the subject of claims by Turkey. On July 2020, France and Austria have called for sactions against Turkey, such as the termination of the Turkey’s EU accession talks. In the same context the EU's Foreign Policy Council convened and agreed for a framework of sanctions to be prepared for use in the event Turkey attempts any violations of Greece's sovereign rights. The Greek FM Dendias expressed his country's readiness to activate the Mutual Defence Clause of the EU's Lisbon Treaty for military assistance.
On 30 May 2020, the Turkish Petroleum Corporation applied to the Turkish Ministry of Energy for exploration permits on the Greek continental shelf, just 6 miles off Crete, Karpathos and Rhodes. TPAO's applications were published to the Turkey's Government Gazette, with a map showing the 24 blocks that Ankara has demarcated from Turkey's shores to the point where its claimed sea borders meet these of Libya, based on the Turkey-GNA maritime agreement. This promted strong reactions both in Greece and abroad, with the Turkish Ambassador to Athens, Burak Özügergin, being summoned to the Greek Foreign Ministry, and the European Union's High Representative of Foreign Affairs, Josep Borrell warning Ankara that the good EU-Turkey relations "will depend critically on the respect of the sovereignty of Cyprus and Greece on the waters under dispute". Furthermore, the United States criticized Turkey, with the US Assistant Secretary of State for Energy Resources Francis R. Fannon stating, during a quadrilateral conference organized by both the American-Hellenic Chamber of Commerce and the Atlantic Council with the participation of USA, Greece, Israel and Cyprus, that such "provocative actions" must end and that the Turkey-GNA agreement "cannot as a legal matter affect the rights or obligations of third states" such as Greece.
On 9 June, and in response to Turkey's moves in the region, Greece and Italy signed through their Foreign Ministers Nikos Dendias and Luigi Di Maio a "historic" agreement for the demarcation of the EEZ between the two countries. The agreement confirms the full rights of islands to their continental shelf and EEZ, in line with the UNCLOS. It uses the median line that was used for the 1977 Italy-Greece continental shelf demarcation agreement as the basis of the EEZ boundary. In the mutually agreed minor adjustments, part of the EEZ of the small Greek islands of Strofades, Othoni, and Mathraki was traded off for an equal area elsewhere. According to Dendias, this creates an extremely favorable legal precedent for Greece in its dispute with Turkey. The United States, the Libyan House of Representatives, and the LNA led by Halifa Haftar, welcomed the EEZ agreement between Greece and Italy, with the US calling it "exemplary" and "an example of how these things should be done ", while reiterating their opposition to the Turkey-GNA EEZ agreement. Following the agreement, the Libyan House of Representatives sent an official invitation to the Hellenic Parliament for a similar EEZ agreement to be reached between Libya and Greece too, with talks beginning on July 1. Dendias stated that Libyan-Greek talks are "not within the arbitrariness that so-called Sarraj-Turkey memorandum is constituting", but within the framework of UNCLOS and in continuation of the 2010 talks between the two countries. In this context, a committee of experts is formed by the President of the Libyan Parliament, Aguila Saleh. The LNA published a map with the proposed EEZ boundaries between Libya and Greece, in which Libya fully acknowledges the Greek islands' rights to their continental shelf and EEZ. Furthermore, on June 18, a high-level delegation from Greece visited Egypt to negotiate and sign an agreement demarcating the Egyptian-Greek EEZ as well.
On 21 July, Turkey announced plans for a seismic survey south and east of the Greek island of Kastellorizo with the research vessel "Oruç Reis", and issued a Navtex for this purpose, prompting strong reactions both in Greece and abroad. The Greek embassy in Ankara sent a complaint to the Turkish Foreign Ministry, and Germany's Foreign Minister Heiko Maas warned Turkey with consequences. Turkey dispatched its naval forces to the region around Kastellorizo, and Turkish armed jets conducted low overflights and dogfights above the island, causing the tourists to evacuate it, and the Greek Armed Forces to be put on alert. The Turkish Ambassador to Berlin, Ali Kemal Aydın, was summoned to the German Foreign Ministry and the German Chancellor Angela Merkel held phone calls with the Greek Prime Minister Kyriakos Mitsotakis and the Turkish President Tayip Erdogan in a bid to de-escalate the situation. According to the German tabloid newspaper Bild, it was Merkel's last-minute intervention that prevented a crisis between Greece and Turkey. This was later confirmed by the German Defence Minister, Annegret Kramp-Karrenbauer. Along with Germany, France, Spain and the United States also backed Greece, with the French President Emmanuel Macron calling for sanctions against Turkey for the violation of Greece's sovereignty, the US envoy to Athens acknowledging Kastellorizo's "exactly the same" rights to EEZ and Continental Shelf as mainlands, and the State Department urging Turkey to halt its plans for surveys in the area around the island.

EastMed pipeline

On 2 January 2020, the leaders of Greece, Cyprus, and Israel signed an accord to build the EastMed pipeline. The planned pipeline will transport natural gas from the Levantine Basin to Greece and from there to Italy and the rest of Europe. Energy expert Brenda Schaffer interprets the EastMed pipeline as a joint attempt to exclude Turkey from the "Club Med" gas club, and the decision to sign the pipeline accord was taken in response to the Turkish-GNA deal.

Flight information regions

Unlike the issues described so far, the question of flight information regions does not affect the two states' sovereignty rights in the narrow sense. A FIR is a zone of responsibility assigned to a state within the framework of the International Civil Aviation Organization. It relates to the responsibility for regulating civil aviation. A FIR may stretch beyond the national airspace of a country, i.e. over areas of high seas, or in some cases even over the airspace of another country. It does not give the responsible state the right to prohibit flights by foreign aircraft; however, foreign aircraft are obliged to submit flight plans to the authorities administrating the FIR. Two separate disputes have arisen over flight control in the Aegean: the issue of a unilaterally proposed revision of the FIR demarcation, and the question of what rights and obligations arise from the FIR with respect to military as opposed to civil flights.

Demarcation

By virtue of an agreement signed in 1952, the whole airspace over the Aegean, up to the boundary of the national airspace of Turkey, has been assigned to Athens FIR, administered by Greece. Shortly after the Cyprus crisis of 1974, Turkey unilaterally attempted to change this arrangement, issuing a notice to airmen stating that it would take over the administration of the eastern half of the Aegean airspace, including the national airspace of the Greek islands in that area. Greece responded with a declaration rejecting this move, and declaring the disputed zone unsafe for aviation due to the conflicting claims to authority. This led to some disruption in civil aviation in the area. Turkey later changed its stance, and since 1980 has returned to recognizing Athens FIR in its original demarcation. In practice, the FIR demarcation is currently no longer a disputed issue.

Turkish Military overflights

the current controversy over the FIR relates to the question whether the Greek authorities have a right to oversee not only civil but also military flight activities in the international parts of the Aegean airspace. According to common international practice, military aircraft normally submit flight plans to FIR authorities when moving in international airspace, just like civil aircraft do. Turkey refuses to do so, citing the ICAO charter of 1948, which explicitly restricts the scope of its regulations to civil aircraft, arguing that therefore the practice of including military aircraft in the same system is optional. Greece, in contrast, argues that it is obligatory on the basis of later regulations of the ICAO, which it claims have given states the authority to issue more wide-reaching restrictions in the interest of civil aviation safety.
This disagreement has led to similar practical consequences as the issue of 6 versus 10 miles of national airspace, as Greece considers all Turkish military flights not registered with its FIR authorities as transgressions of international air traffic regulations, and routinely has its own air force jets intercepting the Turkish ones. In popular perception in Greece, the issue of Turkish flights in the international part of Athens FIR is often confused with that of the Turkish intrusions in the disputed outer 4-mile belt of Greek airspace. However, in careful official usage, Greek authorities and media distinguish between "violations" of the national airspace, and "transgressions" of traffic regulations, i.e. of the FIR.
One of the routine interception maneuvers led to a fatal accident on 23 May 2006. Two Turkish F-16s and one reconnaissance F-4 were flying in the international airspace over the southern Aegean at without having submitted flight plans to the Greek FIR authorities. They were intercepted by two Greek F-16s off the coast of the Greek island Karpathos. During the ensuing mock dog fight, a Turkish F-16 and a Greek F-16 collided midair and subsequently crashed. The pilot of the Turkish plane survived the crash, but the Greek pilot died. The incident also highlighted another aspect of the FIR issue, a dispute over conflicting claims to responsibility for maritime search and rescue operations. The Turkish pilot reportedly refused to be rescued by the Greek forces that had been dispatched to the area. After the incident, both governments expressed an interest to revive an earlier plan of establishing a direct hotline between the air force commands of both countries in order to prevent escalation of similar situations in the future.

Islands

There have been a number of disputes related to the territories of the Greek islands themselves. These have related to the demilitarized status of some of the main islands in the area; to Turkish concerns over alleged endeavours by Greece to artificially expand settlements to previously uninhabited islets; and to the existence of alleged "grey zones", an undetermined number of small islands of undetermined sovereignty.

Demilitarized status

The question of the demilitarized status of some major Greek islands is complicated by a number of facts. Several of the Greek islands in the eastern Aegean as well as the Turkish straits region were placed under various regimes of demilitarization in different international treaties. The regimes developed over time, resulting in difficulties of treaty-interpretation. However, the military status of the islands in question did not constitute a serious problem in the bilateral relations until the Cyprus crisis of 1974, after which both Greece and Turkey re-interpreted the stipulations of the treaties. Greece, claiming an inalienable right to defend itself against Turkish aggression, reinforced its military and National Guard forces in the region. Furthermore, Greece maintains the position that it has the right to militarize its islands in the same context as the rest of Europe, where the appliance of demilitarization statute on islands and territories ceased with the creation of the North Atlantic Treaty Organization and the Warsaw Pact; i.e. the cessation of demilitarization of Italy's Panteleria, Lampedusa, Lampione and Linosa islands, and West Germany from the NATO side, and the cessation of demilitarization of Bulgaria, Romania, East Germany, Hungary and Finland from the Warsaw Pact's side. Turkey, on the other hand, denounces this as an aggressive act by Greece and as a breach of international treaties. From a legal perspective, three groups of islands may be distinguished: the islands right off the Turkish Dardanelles straits, i.e. Lemnos and Samothrace; the Dodecanese islands in the southeast Aegean; and the remaining northeast Aegean islands.

Lemnos and Samothrace

These islands were placed under a demilitarization statute by the Treaty of Lausanne in 1923, to counterbalance the simultaneous demilitarization of the Turkish straits area, Imbros and Tenedos. The demilitarization on the Turkish side was later abolished through the Montreux Convention Regarding the Regime of the Turkish Straits in 1936. Greece holds that, by superseding the relevant sections of the earlier treaty, the convention simultaneously lifted also the Greek obligations with respect to these islands. Against this, Turkey argues that the Montreux treaty did not mention the islands and has not changed their status. Greece, on the other hand, cites Turkish official declarations, by the then Turkish Minister for Foreign Affairs, Rustu Aras, to that effect made in 1936, assuring the Greek side that Turkey would consider the Greek obligations lifted.

Dodecanese

These islands were placed under a demilitarization statute after the Second World War by the Treaty of peace with Italy, when Italy ceded them to Greece. Italy had previously not been under any obligation towards Turkey in this respect. Turkey, in turn, was not a party to the 1947 treaty, having been neutral during WWII. Greece therefore holds that the obligations it incurred towards Italy and the other parties in 1947 are res inter alios acta for Turkey in the sense of Article 34 of the Vienna Convention on the Law of Treaties, which states that a treaty does not create obligations or rights for a third country, and that Turkey thus cannot base any claims on them. Turkey argues that the demilitarization agreement constitutes a status treaty, where according to general rules of treaty law such an exclusion does not hold.

Lesbos, Chios, Samos, and Ikaria

The remaining islands were placed under a partial demilitarization statute by the Treaty of Lausanne in 1923. It prohibited the establishment of naval bases and fortifications, but allowed Greece to maintain a limited military contingent recruited from the local population, as well as police forces. With respect to these islands, Greece has not claimed that the treaty obligations have been formally superseded. However, in recent years it has argued that it is entitled to discount them, invoking Article 15 of the Charter of the United Nations. It argues that after the Turkish occupation of northern Cyprus and the Turkish threat of war over the 12 miles issue, re-armament is an act of legitimate self-defence.

"Grey zones"

Imia/Kardak

The first time a dispute between the two countries in the Aegean touched on questions of actual sovereignty over territories was in early 1996 at the tiny barren islets of Imia/Kardak, situated between the Dodecanese island chain and the Turkish mainland. The conflict, triggered by the stranding of a Turkish merchant ship on the islets, was originally caused by factual inconsistencies between maps of the area, some of which assigned these islets to Greece, others to Turkey. The media of the two countries took up the issue and gave it a nationalistic turn, before the two governments even had the time to come to a full technical understanding of the true legal and geographical situation. Both governments finally adopted an intransigent stance, publicly asserting their own claims of sovereignty over the islets. The result was military escalation, which was perceived abroad as quite out of proportion with the size and significance of the rocks in question. The two countries were at the brink of war for a few days, until the crisis was defused with the help of foreign mediation.
During the crisis and in the months following it, both governments elaborated legal arguments to support their claims to sovereignty. The arguments exchanged concerned the interpretation of the Treaty of Lausanne of 1923, which forms the principal basis for the legal status of territories in most of the region, as well as certain later diplomatic dealings between Turkey, Greece and Italy.

Other "grey zones"

In the wake of the Imia crisis, the Turkish government widened its argumentation to include not only Imia but also a possibly large number of other islands and small formations across the Aegean. Since then, Turkish authorities have spoken of "grey zones" of undetermined sovereignty. According to the Turkish argument, these islets, while not explicitly retained under Turkish sovereignty in 1923, were also not explicitly ceded to any other country, and their sovereignty has therefore remained objectively undecided.
The Turkish government has avoided stating exactly which islets it wishes to include in this category. On various occasions, Turkish government sources have indicated that islands such as Pserimos, Agathonisi, Fournoi and Gavdos might be included. Most of them, unlike Imia/Kardak, had undeniably been in factual Greek possession, which had never previously been challenged by Turkey, and all but the final two listed below have Greek residents and infrastructure. Furthermore, the islands are covered by previous treaties such as the Treaty of Lausanne, which defines Turkish sovereignty as limited to within 3 miles of the Anatolian mainland in the majority of cases. In a 2004 publication by Turkish authors close to the Turkish military leadership the following were listed as potentially "grey" areas:
While Turkey has not attempted to challenge Greek sovereignty on the ground, its claims about "grey area" islands add to the number of minor military incidents, already numerous due to the 10-mile airspace and the FIR issues. The Turkish Air Force routinely ignores Greek national airspace around such formations that it counts as grey zones. According to Greek press reports, the number of airspace violations rose sharply in 2006, as did the number of unauthorised Turkish military flights directly over Greek islands themselves. Renewed reports of systematic Turkish military flights directly over Greek islands like Pharmakonisi and Agathonisi were made in late 2008 and early 2009.
During the late 2010s, tensions rose again as Turkish fighter aircraft increased the number of direct armed overflights above inhabited Greek islands. While most overflights continue to occur above small islands that Turkey considers "grey areas", such as Agathonisi or Oinousses, some incidents have also repeatedly been reported involving major and undisputed islands such as Rhodes, Lesbos, Chios or Leros. These overflights are perceived in Greece as among the most provocative acts by Turkey, directly challenging Greek territorial sovereignty.
In 2020, Turkish fighter aircraft also begun overflights above the Greek mainland, on Evros.
A regional Foreign Minister conference held on 11 May 2020 with the participation of Cyprus, Egypt, France, Greece and the United Arab Emirates, concluded with a joint declaration condemning Turkey for its practice of conducting armed overflights above the inhabited Greek islands.

Turkish incidents with Frontex

In September 2009, a Turkish military radar issued a warning to a Latvian helicopter patrolling in the eastern Aegean—part of the EU's Frontex programme to combat illegal immigration—to leave the area. The Turkish General Staff reported that the Latvian Frontex aircraft had violated Turkish airspace west of Didim.
According to a Hellenic Air Force announcement, the incident occurred as the Frontex helicopter—identified as an Italian-made Agusta A109—was patrolling in Greek air space near the small isle of Farmakonisi, which lies on a favorite route used by migrant smugglers ferrying mostly illegal migrants into Greece and the EU from the opposite Turkish coastline. Frontex officials stated that they simply ignored the Turkish warnings as they did not recognise their being in Turkish airspace and continued their duties.
Another incident took place in October 2009 in the aerial area above the eastern Aegean sea, off the island of Lesbos. On 20 November 2009, the Turkish General Staff issued a press note alleging that an Estonian Border Guard aircraft Let L-410 UVP taking off from Kos on a Frontex mission had violated Turkish airspace west of Söke.

Strategies of conflict resolution

The decades since the 1970s have seen a repeated heightening and abating of political and military tensions over the Aegean. Thus, the crisis of 1987 was followed by a series of negotiations and agreements in Davos and Brussels in 1988. Again, after the Imia/Kardak crisis of 1996, there came an agreement over peaceful neighbourly relations reached at a meeting in Madrid in 1997. The period since about 1999 has been marked by a steady improvement of bilateral relations.
For years, the Aegean dispute has been a matter not only about conflicting claims of substance. Rather, proposed strategies of how to resolve the substantial differences have themselves constituted a matter of heated dispute. Whereas Turkey has traditionally preferred to regard the whole set of topics as a political issue, requiring bilateral political negotiation, Greece views them as separate and purely legal issues, requiring only the application of existing principles of international law. Turkey has advocated direct negotiation, with a view to establishing what it would regard as an equitable compromise. Greece refuses to accept any process that would put it under pressure to engage in a give-and-take over what it perceives as inalienable and unnegotiable sovereign rights. Up to the late 1990s, the only avenue of conflict resolution that Greece deemed acceptable was to submit the issues separately to the International Court of Justice in The Hague.
The resulting stalemate between both sides over process was partially changed after 1999, when the European summit of Helsinki opened up a path towards Turkey's accession to the EU. In the summit agreement, Turkey accepted an obligation to solve its bilateral disputes with Greece before actual accession talks would start. This was perceived as giving Greece a new tactical advantage over Turkey in determining which paths of conflict resolution to choose. During the following years, both countries held regular bilateral talks on the level of technical specialists, trying to determine possible future procedures. According to press reports, both sides seemed close to an agreement about how to submit the dispute to the court at The Hague, a step which would have fulfilled many of the old demands of Greece. However, a newly elected Greek government under Kostas Karamanlis, soon after it took office in March 2004, opted out of this plan, because Ankara was insisting that all the issues, including Imia/Kardak and the "grey zones", belonged to a single negotiating item. Athens saw them as separate. However, Greek policy remained at the forefront in advocating closer links between Ankara and the EU. This resulted in the European Union finally opening accession talks with Turkey without its previous demands having been fulfilled.