What nation that had signed a nonaggression pact with germany eventually joined the allies

Soviet Union had signed a nonaggression pact with Germany. But later they joined the allies.

Explanation: Just before the second world war Adloff Hitler and Joseph Stalin shocked the world by signing on a nonaggression pact on August 23,1939. The theme was of the pact was two of the countries would not use military force each other. But during the world war when the Nazi force attacked Soviet Union the pact was broken. Then Soviet union joined the allies.

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