A meeting between the Allied leaders Stalin, Churchill, and Franklin D. Roosevelt at Yalta in the Soviet Union. They discussed the final stages of World War II, as well as the subsequent division of Germany. Stalin obtained agreement that the Ukraine and Outer Mongolia should be admitted as full members to the United Nations, whose founding conference was to be convened in San Francisco two months later. Stalin also gave a secret undertaking to enter the war against Japan after the unconditional surrender of Germany and was promised the Kurile Islands and an occupation zone in Korea. The meeting between the Allied heads of state was followed five months later by the Potsdam Conference.