In 1917, because Vladimir Lenin was leading the Communist revolution against the Tsar in Russia, and the communist party at this point had no quarrel with the Germans. The country was a still in a mess because of the revolution, so it needed its focus to be on sorting itself out, rather than still fighting. Because of this, The German's could withdraw it's troops and resources from the Eastern front, to boost the forces fighting the British and French troops on the Western front, where America would soon Fight as well. I hope that answers your question, and is accurate enough xD http://en.wikipedia.org/wiki/WW1#Russian_Revolution Try that also [=
They left cause lack of food water and resources .
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When the Soviet Union was formed, Russia was to busy capturing small closer nations to make themselves stronger the signed treaty with the Allies and later on allied with Germany. It was until World War 2 when there allies were broken with the German invasion of the Soviet Union.
in 1918 Russia signed a treaty with the centals powers with drawing from the war
Russia dropped out of WWI after signing the Treaty of Brest-Litovsk on March 3, 1918.
Treaty of Brest-Litovsk
Russia's participation in WW1 is often flossed over by historians in general because they quit the war right in the middle of it (due to their Bolshevik Revolution); afterwards in which faster paced actions buried the Russian's participation into obscurity. Italy experienced the same thing; only a brief mentioning in the history books, because they quit WW2 right in the middle of it, in 1943.
the bolsheviks seized power
Imperial, Christian (Eastern Orthodox) and broke
If you are referring to WW1, then russia left early