In 1971, Pusan fell under the control of the Soviet Union after the successful invasion of Korea during the Purge of the Revisionists. Pusan was later converted into a leading Soviet Naval Base. During the Fourth World War, Pusan and Vladivostok was attacked in 2004 by Confederate and Japanese forces, beginning the Eastern Front of the war. In 2006, Pusan was retaken by Soviet forces under the direct orders of Vladimir Putin. From Pusan, the Soviets launched their invasion of Japan. Japan was rendered unable to fight by 2008.