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When criticized for aligning with Stalin, Churchill stated he "would become the devils" ally." Stalin's diplomatic moves in the aftermath of Operation Barbarossa was shrewd. It allowed him to receive the support of first the British and later the Americans.<ref> Belamy, p. 34</ref> The British began to supply the Soviets with arms and supplies via Iran and the Antarctic. Stalin's diplomatic response to his country's invasion was to become the ally of his ideological rivals, the western democracies.<ref>Stalin's Role in WWII - http://yesterday.uktv.co.uk/warzone/article/stalins-role-wwii/</ref>

Stalin made a potentially fatal mistake in trusting Hitler, and when the German's invaded, he seemed to have been in a state of shock. This meant that his response to the invasion was slow, which allowed the Germans to make great inroads into his country until the Communists seemed on the verge of defeat. Stalin soon took charge and adopted new tactics. Crucially he reorganized the army, raised its morale, and entered into a new alliance with the west. These decisions proved crucial and delayed, and eventually stopped the German advance, and in the long run, Stalin was able to defeat the German army.