During the formation of the movement Egyptian and Lebanese officials attended the announcement. Although the party aims to oppose the government of Bashar al-Assad, a Russian embassy official and pro-Assad Syrians attended the official launch of the party, along with the Palestinian official Mohammed Dahlan. A Kurdistan Regional Government representative also attended the meeting. In early April 2016, the head of Syria's Tomorrow Movement, Fouad Humeira, met with Anas Al-Abdah, the head of the Movement for Justice and Development in Syria and the overall president of the Syrian National Coalition. Al-Abdah expressed the SNC's readiness to cooperate with Syria's Tomorrow Movement. In September Ahmad Jarba met with the leader of the Movement for a Democratic Society, representing the de facto autonomous administration of the Federation of Northern Syria - Rojava, in order to form an agreement to participate in the governing of northeastern Syria. They issued a joint statement that "the monist powers insisting on one party, one flag and one nation are doomed to fail, and peoples are trying to realize their dreams for a democratic, pluralist and united Syria." Weeks later, the Local Coordination Committees of Syria reported that a US helicopter transported Ahmed Jarba and Syrian actor Jamal Suliman from Iraqi Kurdistan to the Abu Hajar Airport near the town of Rmelan in northeastern Syria. After they arrived, the two met with the PYD official Eldar Khalil, along with politicians from other Kurdish parties in Syria. The movement also signed an agreement with the National Coordination Committee for Democratic Change. On 22 July 2017, the Syria's Tomorrow Movement, led by Ahmad Jarba, was involved in negotiations in Egypt between Russia and Jaysh al-Islam to implement a partial ceasefire in East Ghouta.
Military wing
On 18 April 2016, a unit of Free Syrian Army fighters of al-Shaitat and Shammar, originally from Deir ez-Zor Governorate and the Hasakah Governorate and calling themselves the Elite Forces, declared themselves to be the armed wing of Syria's Tomorrow Movement and stressed Kurdish-Arab unity in Syria. The group claimed to have captured 3 villages from the Islamic State of Iraq and the Levant 60 kilometres north of Deir ez-Zor. The Syrian Democratic Forces welcomed the presence of the Elite Forces although the group is not officially allied with it. Ahmad Jarba reportedly shipped weapons from Iraqi Kurdistan to Syria in order to arm the faction. On 10 April 2017, a purported spokesman for the Elite Forces claimed that the group was not part of the SDF, would cooperate with both the SDF and Rojava Peshmerga to capture Deir ez-Zor, and rejected federalism. On 15 April, this statement was denied by Muhammad Khalid Shakir, the official spokesman of the Elite Forces. He denied any disagreements between the Elite Forces and the SDF and said that "We are in the framework of the international coalition. The leadership of the coalition manages the operations on the ground. Our troops did not withdraw. We have completed the third phase of the Wrath of Euphrates Operation, and we will participate in all stages until Raqqa and Deir ez-Zor are freed." While the Battle of Raqqa was still ongoing, the Elite Forces officially left the SDF, though elements of the group continued to cooperate with the SDF. On 25 August 2017, 800 fighters left the Elite Forces and were fully integrated into the ranks of the SDF and its Deir ez-Zor Military Council. The fighters accused the Elite Forces of corruption. These forces consisted of 7 units of al-Baggara and al-Shaitat tribal fighters stationed in the eastern Raqqa and southern Hasaka countrysides, including the Gathering of al-Baggara Youth, led by Yasser al-Dahla. By early 2019, the Elite Forces were still active, but had very few troops left.
