1.5 million Soviet Jews killed by the German invaders.[10] The mass destruction and mass murder was one of the reasons why the Soviet Union installed satellite states in Central Europe; as the government hoped to use the countries as a buffer zone against any new invasions from the West. This helped break down the wartime alliance between the Soviet Union and the Western Allies, setting the stage for the Cold War, which lasted until 1989, two years before the dissolution of the Soviet Union in 1991. Soviet culture in the 1950s was defined by results of the Great Patriotic War.