Soviet troops had liberated countries in Eastern Europe but didn't withdraw their troops - Stalin kept them there
By July Stalin's troops effectively controlled the Baltic States, Finland, Poland, Czechoslovakia, Hungary, Bulgaria, Romania
Refugees were fleeing out of these countries fearing a communist take-over
Stalin had set up a communist gov in Poland - against wishes of majority of Poles
Britain+USA protested
Stalin defended his action by saying that his control of Eastern Europe was a defensive measure against possible future attacks