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Context/explanation:
US president Franklin Roosevelt, British prime minister Winston Churchill, and Soviet premier Joseph Stalin, the leaders of the Allies in World War II, met at Yalta in February, 1945.
Roosevelt wanted to get Stalin to agree to Russia's entry into the war against Japan -- and Stalin agreed to that (in exchange for the promise of territory returned to Soviet control that had been lost to Japan in the Russo-Japanese War of 1904-05). Stalin kept that promise. In August 1945, Soviet troops invaded Manchuria to battle occupying Japanese forces there. The Soviets also took control of northern Korea away from the Japanese.
Churchill in particular (along with Roosevelt) pushed strongly for Stalin to allow free elections to take place in the nations of Europe after the war. At that time Stalin agreed, but there was a strong feeling by the other leaders that he might renege on that promise. The Soviets never did allow those free elections to occur. Later, Winston Churchill wrote, ""Our hopeful assumptions were soon to be falsified." Stalin and the Soviets felt they needed the Eastern European nations as satellites to protect their own interests.
