Step 1: Understanding the history of the Russian presidency.
Boris Yeltsin was the first elected President of Russia, elected in 1991 after the dissolution of the Soviet Union. He served as president until 1999.
Step 2: Analysis of options.
- (1) Leonid Brezhnev: Brezhnev was the leader of the Soviet Union but never the president of Russia.
- (2) Nikita Khrushchev: Khrushchev was the Soviet leader but not the elected president of Russia.
- (3) Joseph Stalin: Stalin was the dictator of the Soviet Union but never the elected president of Russia.
- (4) Boris Yeltsin: Yeltsin was the first elected president of Russia after the Soviet Union's collapse.
Step 3: Conclusion.
The correct answer is (4) Boris Yeltsin.