For this episode of History Undone, James is joined by Rear Admiral Dr Chris Parry and the historian Roger Moorhouse to discuss one of the most significant moments at the beginning of the Second World War. Despite their huge differences and animosity, in August 1939 Germany and the Soviet Union signed a non-aggression treaty otherwise known as the Molotov-Ribbentrop Pact. Yet with Operation Barbarossa and the invasion of the Soviet Union in 1941, Hitler betrayed that trust. Yet what if he hadn't and what if it had held for the remainder of the war? This is History Undone.

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