Which leader of the Soviet Union proposed Asian Collective Security system?

Leonid Brezhnev

The correct answer is Option (3) → Leonid Brezhnev

Leonid Brezhnev (1906-82):  Leader of the Soviet Union (1964 82); proposed Asian Collective Security system; associated with the détente phase in relations with the US; involved in suppressing a popular rebellion in Czechoslovakia and in invading Afghanistan.