Answer:
Mikhail Gorbachev.
Step-by-step explanation:
Mikhail Gorbachev became the first president of the Soviet Union in 1990 and received Nobel Price for promoting peaceful international relations and ending Cold War. Gorbachev's key political changes included a more democratic system of elections. He abolished the special status of the Communist Party, as set out in the constitution of the USSR. State power was turned over to the USSR People's Duties Congress, the first parliament in the Soviet Union, based on democratic elections.