Final answer:
Leonid Ilyich Brezhnev was the leader of the Soviet Union during the Cold War era of the 1960s-1970s.
Explanation:
Leonid Ilyich Brezhnev led the Soviet Union through most of the Cold War period of the 1960s to 1970s. He succeeded Nikita Khrushchev in 1964 and remained in power until his death in 1982. Brezhnev's leadership was characterized by a rollback of Khrushchev-era reforms and the implementation of the 'Brezhnev Doctrine,' justifying Soviet interventions in Eastern Bloc countries.
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