In 1990, Kosopkin was elected as the People's Deputy of the RSFSR in the Zlatoust Territorial District No.

Between 1990 and 1993, he was the Chairman of the Subcommittee of the Commission on Social Policy of the Supreme Soviet of the Russian Federation.

[3] From 1993 to 1994, he was the Leading Specialist of the Department of Information Technology Support of the Office of the Federal Assembly of Russia.

[5] He was buried on 14 January 2009, in the village of Komlevo, Ruzsky District, Moscow Oblast, at a church cemetery.

[6] In 2010, the Investigative Committee under the Prosecutor's Office of Russia indicted the surviving passengers of this helicopter for illegal hunting.

Two of them - the former deputy chairman of the government of the Altai Republic, Anatoly Bannykh and the deputy director of the Institute of Economics and Legislation of the city of Moscow, Nikolay Kapranov - were put on the federal wanted list.