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Joachim von Ribbentrop (left), Josef Stalin, and Vyacheslav Molotov (right) - On August 23, 1939, German Foreign Minister Joachim von Ribbentrop met with Soviet dictator Josef Stalin and his Foreign Minister Vyacheslav Molotov at the Kremlin. By dawn, the two powers had signed a nonaggression pact -- as well as a secret protocol establishing "spheres of influence" in Central Europe.