September 17, 1939, the Soviet Union invaded Poland, which had been already countering German aggression. It was a stab in the back.

The liquidation of the Polish state and the division of its territory were the key tenets of Hitler and Stalin's treacherous, secret agreement that brought death to millions.

"The invasion was dressed up as a military intervention. Rather similar to what we see today with Russia's invasion of Ukraine," says Roger Moorhouse.

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