In February of 1945, the Big Three met in Yalta. What disagreements did they have over the postwar world?

The Yalta Conference was a meeting of three World War II allies: U. S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill and Soviet Premier Joseph Stalin. The trio met in February 1945 in the resort city of Yalta, located along the Black Sea coast of the Crimean Peninsula. The "Big Three" Allied leaders discussed the post-war fate of defeated Germany and the rest of Europe, the terms of Soviet entry into the ongoing war in the Pacific against Japan and the formation and operation of the new United Nations.