On 8 August 1945, the Soviet Union declared war on Japan, in accordance with the agreement at the Yalta Conference, and invaded Manchukuo from outer Manchuria and Outer Mongolia. During the Soviet offensive, the Manchukuo Imperial Army, on paper a 200,000-man force, performed poorly and whole units surrendered to the Soviets without firing a single shot; there were even cases of armed riots and mutinies against the Japanese forces. Emperor Kangde had hoped to escape to Japan to surrender to the Americans, but the Soviets captured him and eventually extradited him to the government of China, when the Chinese Communist Party came to power in 1949, where the authorities had him imprisoned as a war criminal along with all other captured Manchukuo officials.