World War I
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The tzar Nicholas II
Japan had fought a war with Russia and had invaded Manchuria prior to the start of World War II.
Then World war 3 will start if they started to fight.
Russia joined world war 1 in 1914
Germany's introduction of unrestricted submarine warfare, leading to the deaths of Americans, rallied the US populace to war. Wilson gained support for the war by saying Russia's revolution will lead to world peace. This was in his "War Message".
Russia offered support to the Union in the U.S. Civil War because Russia thought the United States was a good counterbalance to the British Empire.
World War 1 left Russia's economy in complete devastation. By the end of the war Russia had 8,000,000,000 rubles of debt.
Vladimir Lenin took Russia out of World War 1.
Vladimir Lenin is the leader who wanted to get Russia out of World War 1.
'Russia' was too busy to involve US into a World War I as there was a revolution in Russia at that time.