 On concluding the Great Patriotic War (1941–1945), the Soviet Union was a military superpower with a say in determining the geopolitical order of the world.In accordance with the three-power Yalta Agreement (4–11 February 1945), the Soviet Union purged native fascist collaborators from the Eastern European countries occupied by the Axis Powers and installed native Communist governments.Upon Allied victory concluding the Second World War (1939–1945), the members of the Grand Alliance resumed their expediently suppressed, pre-war geopolitical rivalries and ideological tensions which disunity broke their anti-fascist wartime alliance into the anti-communist Western Bloc and the communist Eastern Bloc.