Answer:Vladimir Lenin
Lenin was leader of the Russian Soviet Federative Socialist Republic (RSFSR) from 1917 and leader of the Union of Soviet Socialist Republics (USSR) from 1922 until his death.
Conflict: 1991 Soviet coup d'état attempt
Officeholder: Konstantin Chernenko; Mikhail Gorbachev.
Explanation:There is no doubt that this is the right answer.