What if, Roosevelt/Truman decides that a full scale invasion of Japan is more humane then just nuking them, stoping the Manhatten Project, so he teams up with the Soviets, British and Chinese to invade the Japanesse Empire, and the POD for the invasion can be between 43 and 45, the Soviets and Americans going for Tokyo, and the Chinese and British going for China and Mainland Asia, how does this change the course of the war?