When did the Soviet Union attack Afghanistan?

The correct answer is Option 4 - 1979

Soviet attacked Afghanistan in 1979.

Leonid Brezhnev, who led the Soviet Union from 1964 to 1982, introduced the concept of the Asian Collective Security system and played a prominent role in the détente phase of Soviet-American relations. His leadership was marked by significant international events, including the suppression of a popular rebellion in Czechoslovakia and the controversial invasion of Afghanistan.