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Tsar Nicholas II was the leader of Tsarist Russia in World War 1.
Nicholas II was the Tsar of Russia at the beginning of the war.
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Both world wars had Germany on one side and Britain, France, the United States, Russia, and China on the other. Differences include the fact that the Russia of World War I was the imperial Russian Empire while the Russia of World War II was the communist Soviet Union. Countries that changed sides include Turkey (for Germany in World War I, neutral in World War II), the Austro-Hungarian Empire (for Germany in World War I, no longer existed by the time of World War II), Italy (against Germany in World War I, for Germany in World War II), and Japan (against Germany in World War I, for Germany in World War II).
Russia didn't withdraw from World War 2. They were in the fight until it was over. In World War 1, Russia broke into a civil war, referred to as the Russian Revolution, causing the Communists to take over Russia, creating the Soviet Union.
Russia was taken out of World War One by Lenin and his agreement with Germany to end Russia's participation in the war. The assassination of Czar Nicholas II and his family had nothing to do with Russia's end as a player in WW 1.
Tsarist Russia in World War I and the Soviet Union in World War II.
The tzar Nicholas II
World War II
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