The Allies agreed to divide Germany into four occupation zones controlled by the United States, United Kingdom, France, and the Soviet Union. The Soviets agreed to declare war on Japan and in return were given control over territories in Eastern Europe. At the Potsdam Conference, the Allies made final decisions about Germany including forcing demilitarization, denazification, and war crimes trials. The Nuremberg Trials then began, led by the United States and other Allied countries, to prosecute Nazi leaders for crimes against humanity and war crimes.