Question: The 6th Canadian Infantry Division was originally scheduled to participate in this proposed Allied plan for the invasion of Japan near the end of World War II but the plan was abandoned after the Soviet invasion of which region? 
Sentence (from "Operation Downfall"): The planned operation was abandoned when Japan surrendered following the atomic bombings of Hiroshima and Nagasaki, the Soviet declaration of war and the Soviet invasion of Manchuria.
Relevant evidence: Yes