Nazi–Soviet Non-Aggression Pact
Also called: Molotov–Ribbentrop Pact, Hitler–Stalin Pact
Ideological enemies Nazi Germany and the Soviet Union promised not to attack each other and divided Eastern Europe in a secret protocol. Nine days later Germany invaded Poland.

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After Munich the Soviet Union distrusted Britain and France, and the three-power military talks of summer 1939 made little headway. Hitler, preparing to invade Poland, wanted to avoid a war on two fronts. On 23 August German foreign minister Ribbentrop flew to Moscow and in the Kremlin signed a ten-year non-aggression pact with Soviet foreign commissar Molotov.
A secret protocol divided Poland between the two powers and assigned Finland, Estonia, Latvia and Romanian Bessarabia to the Soviet sphere. Germany invaded Poland on 1 September and the Soviet Union on the 17th, and in 1940 the USSR annexed the Baltic states and Bessarabia. Moscow denied the secret protocol existed until finally acknowledging it in 1989. The pact was broken by Germany’s invasion of the Soviet Union in June 1941.