On the 8 August 1945, the Soviet Union declared war on the Empire of Japan. The Soviet Red Army invaded Manchuria from the north. By 20 August 1945 the Red Army had overrun almost all of Manchukuo. The Japanese Empire surrendered unconditionally ending World War II and simultaneously Manchukuo ceased to exist. Puyi fled the palace, attempting to reach Japan by plane, but was captured by the Soviets. The palace and surrounding city were looted.