A week before Nazi Invasion of Poland non-aggression pact was signed between Russia and Germany. This pact is known as Nazi-Soviet Non-Aggression Pact or Molotov-Ribbentrop Pact. This pact was signed to keep the peaceful relationship between the Soviet Union and Nazi Germany. It was agreed in the pact that both the countries will not any military against each other for the next 10 years. Soviet Union leader Joseph Stalin also want to gain some time to rebuild his army.

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