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<unk> Soviet tanks rolled into Czechoslovakia on the night of 20<unk>21 August 1968. General Secretary of the Soviet Communist Party Leonid Brezhnev viewed this intervention as vital for the preservation of the Soviet, socialist system and vowed to intervene in any state that sought to replace Marxism-Leninism with capitalism.<unk> General Secretary of the Soviet Communist Party Leonid Brezhnev viewed this intervention as vital for the preservation of the Soviet, socialist system and vowed to intervene in any state that sought to replace Marxism-Leninism with capitalism.