The same year , the USSR , in fulfillment of its agreement with the Allies at the Yalta Conference , denounced the Soviet – Japanese Neutrality Pact in April 1945 and invaded Manchukuo and other Japan-controlled territories on 9 August 1945 . This conflict ended with a decisive Soviet victory , contributing to the unconditional surrender of Japan and the end of World War II
Yalta Conference
Yalta Conference
Soviet Union