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Why was Stalin surprised by Hitler’s attack?
German land forces were losing strength just prior to the attack.
German forces were stuck in a stalemate in France and attacking the Soviet Union split their forces.
The Soviet Union had adopted an isolationist policy and had made no aggressive actions in Europe.
The Soviet Union was an Axis Power.
The Soviet Union and Germany had signed the Nazi-Soviet Nonaggression Pact before the War began.