Khruschev, but Zyzz does have somewhat of a point. Khruschev was a bit of a buffoon. Under Brezhnev, the USSR reached military parity with the US. Both of them suffered diplomatic defeats. Khruschev lost China, but since it was for denouncing Stalin, he can be forgiven for it. Brezhnev lost Egypt, and by extension the entire Middle East, and was forced to invade Afghanistan.
Yea Khrushchev was a bit of a buffoon on the world stage. He also banged his shoes on the table at the UN and made the 'we will bury you' statement. That statement scared the crap out of a lot of westerners and they assumed it meant that they would bury us in a nuclear war.