The 1968 Red Square demonstration (Russian: Демонстра́ция 25 а́вгуста 1968 го́да) took place on 25 August 1968 at Red Square, Moscow, Soviet Union, to protest the invasion of Czechoslovakia by the Soviet Union and its Warsaw Pact allies, that occurred during the night of 20–21 August 1968, crushing the Prague Spring, a set of de-centralization reforms promoted by Alexander Dubček.