As you might remember from episode 124, which was about the Allied victory in Europe, Germany was basically cut in half by the invading Soviets in the East, and the Allies in the West.  The Soviets had captured Berlin, and they had also occupied the eastern part of Germany.  But they also had occupied all of eastern Europe, including Poland, Czechoslovakia, Hungary, Romania, Yugoslavia, Albania, Bulgaria, Lithuania, Latvia, and Estonia.  And they had no intention of giving those countries up.