EVENTS
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On June 22, 1941, Nazi Germany and its Axis allies began a massive invasion of the Soviet Union named Operation Barbarossa -- some 4.5 million troops launched a surprise attack deployed from German-controlled Poland, Finland, and Romania. Hitler had long had his eye on Soviet resources. Although Germany had signed a non-aggression pact with the USSR in 1939, both sides remained suspicious of one another, and the agreement merely gave them more time to prepare for a probable war.