The Molotov–Ribbentrop Pact was a non-aggression pact between Nazi Germany and the Soviet Union that partitioned Eastern Europe between them. The pact was signed in Moscow on 23 August 1939 by German Foreign Minister Joachim von Ribbentrop and Soviet Foreign Minister Vyacheslav Molotov and was officially known as the Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics. Unofficially, it has also been referred to as the Hitler–Stalin Pact, Nazi–Soviet Pact or Nazi–Soviet Alliance.
The treaty was the culmination of negotiations for an economic agreement between the USSR and Nazi Germany which the Soviets used to obtain a political agreement – see Nazi–Soviet economic relations (1934–1941) deal discussions. On 22 August, Ribbentrop flew to Moscow to finalize the treaty, which the Soviets had sought before with Britain and France. The Molotov–Ribbentrop pact, signed the next day, guaranteed peace between the parties and was a commitment neither government would aid or ally itself with an enemy of the other. In addition to the publicly-announced stipulations of non-aggression, the treaty included the Secret Protocol, which defined the borders of Soviet and German spheres of influence across Poland, Lithuania, Latvia, Estonia and Finland. The secret protocol also recognised the interest of Lithuania in the Vilnius region, and Germany declared its complete uninterest in Bessarabia. The rumoured existence of the Secret Protocol was proven only when it was made public during the Nuremberg Trials.
Soon after the pact, Germany invaded Poland on 1 September 1939. Soviet leader Joseph Stalin ordered the Soviet invasion of Poland on 17 September, one day after a Soviet–Japanese ceasefire came into effect after the Battles of Khalkhin Gol, and one day after the Supreme Soviet of the Soviet Union approved the Molotov–Ribbentrop Pact. After the invasions, the new border between the two countries was confirmed by the supplementary protocol of the German–Soviet Frontier Treaty.
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World War II or the Second World War, often abbreviated as WWII or WW2, was a global conflict lasting from 1939 to 1945. The vast majority of the world's countries, including all of the great powers, fought as part of two opposing military alliances: the Allies and the Axis. Many participants threw their economic, industrial, and scientific capabilities behind this total war, blurring the distinction between civilian and military resources.
The Cold War was a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported opposing sides in major regional conflicts known as proxy wars. The conflict was based on the ideological and geopolitical struggle for global influence by these two superpowers, following their roles as the Allies of World War II that led to victory against Nazi Germany and Imperial Japan in 1945.
The Invasion of Poland, also known as the September Campaign, Polish Campaign, War of Poland of 1939, and Polish Defencive War of 1939 (1 September – 6 October 1939), was a joint attack on the Republic of Poland by Nazi Germany, the Slovak Republic, and the Soviet Union; which marked the beginning of World War II. The German invasion began on 1 September 1939, one week after the signing of the Molotov–Ribbentrop Pact between Germany and the Soviet Union, and one day after the Supreme Soviet of the Soviet Union had approved the pact.