Barbarossa and Britain

Seventy years ago, over three million German troops stormed into the Soviet Union. David Reynolds – whose new film on Stalin and Churchill is shown on BBC Four this month – explains how a Nazi victory could have had grave implications for Britain

Operation Barbarossa, which began on 22 June 1941, saw more than three million German troops surge into the Soviet Union along a front of more than 1,000 miles. (Photo by Art Media/Print Collector/Getty Images)

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