Kumarin was born in Tambov, after compulsory military service he came to Leningrad to study. In the 1980s he served his first sentence for possession of arms and forged documents. Thereafter he met a compatriot from Tambov, Valery Ledovskikh with whom he founded a gang. The gang initially invited only persons from Tambov region. Being not yet strong enough to operate independently the gang merged into the large criminal group Velikolukskaya and was engaged mostly in commercial racket. In 1989 multiple Kumarin's gang members were convicted for the bloody firefight with another criminal gang, Malyshevskaya. The verdict was rather mild, supposedly because the state prosecutor was severely injured by the unknown persons during the investigation. After having completed a short sentence, Kumarin's gang has swiftly taken over racket all across the North-Western region of Russia - Leningrad, Pskov, Novgorod, Karelia - challenging the business affairs of his former 'host gang'. A bloody skirmish with Velikolukskaya gang caused Kumarin to fall into a month-long coma. His right arm had to be amputated at the shoulder and bullets pierced his stomach, chest and lungs. To this day he still has bullet fragments in his heart. During mid-1990-ties Kumarin attempted to legalize the criminal earnings of his gang using the extensive contacts with the government of St. Petersburg city headed by mayor Anatoly Sobchak, to whom the current Russian President Vladimir Putin served as assistant. Kumarin was an investor to the Kirishinefteorgsintez oil refinery and member of the Board of Petersburg Fuel Company controlled by Kumarin. PTK became the sole supplier of gasoline to the municipal transport of St. Petersburg. Since late 1990-ties few senior members of Kumarin's structures as well as of its adversaries were killed and a row of investigations of his past criminal affairs was published. In June 2003, the magazine Der Spiegel mentioned that, according to the German ministry of criminal affairs, the German firm St. Petersburg Real Estate Holding Company had fallen under suspicion of being involved in a money laundering scheme through the Cali cocaine cartel with connections to Kumarin. Russian co-owner of the SPAG's joint venture was the government of Saint-Petersburg and Vladimir Putin, then the municipal official, was a member of the board from 1992 to 2000. In April 2004 German police interrogated Kumarin but no indictments were made. It has been suggested that Kumarin maintained good relations to Russian politicians Mikhail Glushenko and Alexander Filatov. Allegedly after refusing to back down from a business deal in favour of a politician close to Vladimir Putin, Kumarin was raided and arrested by 300 special forces officers on August 24, 2007. Prosecutor GeneralYury Chaika accused him of banditry and organizing a gang. He was also accused of the murder attempt on businessman Sergei Vasiliev, a rival in the oil business. In 2006, two men with automatic rifles sprayed Vasiliev's car with gunfire, wounding him and killing one of his bodyguards. Kumarin sought to clean up his image via donations to charities and the Russian Orthodox Church of which he was a devout follower as well as securing the release of two kidnapped children of Sergey Borodulin, Russian businessman. During this period his celebrity grew as well, dozens of celebrities and politicians attended his 50th birthday party in 2006. Kumarin was interviewed by Andrey Konstantinov, author of book Bandit Petersburg. Since 2004 Kumarin-Barsukov served as assistant to the St.Petersburg municipal MP, Alexander Nevzorov, well-known Russian journalist, who endorsed Kumarin as the "perfectly clean person" and invited Kumarin to play the role of King Louis XIV in his film. During the 1990-ties, however, Nevzorov covered multiple raids of Kumarin's gang in prime-time TV shows making the gang notorious among the public. After the 2007-2009 investigation Kumarin was sentenced to 14 years in prison plus a fine for the episodes of racket, fraud, money laundering and a murder attempt. The verdict was challenged in the European Court of Human Rights and by 2011 his sentence was reduced by 2.5 years. In 2012 another long investigation of Kumarin's affairs starts. Kumarin was accused of contracting a killing of Galina Starovoitova. Main witness against Kumarin was Mikhail Glushenko a.k.a. Misha-Khokhol, who in turn was in 2015 sentenced for 17 years in prison for arranging of the murder of Starovoitova. In March 2019, he was sentenced by the Court of St. Petersburg to 24 years in prison for creating The Tambov Gang.
