Which factor aroused Soviet suspicions of the Western Allies during World War II?

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The Western Allies' long delay in opening a second front in Western Europe aroused Soviet suspicions because Stalin felt that the Allies were intentionally prolonging the war and allowing the Soviet Union to bear the brunt of the fighting against Germany. This mistrust would later contribute to the development of tensions during the Cold War.

Which Factor Aroused Soviet Suspicions of the Western Allies During