Russia because of the bolsheviek revolution in 1917.
Technically, it was the Russian Revolution in 1917, which led to the Russian Civil War, which was won by the Bolsheviks.
Russia
Russia withdrew from World War 1.
Russia withdrew from World War 1 as a result of the October Revolution which led to the formation of the USSR.
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Vladimir Lenin withdrew Russia from World War 1 by entering into the Treaty of Brest-Litovsk.
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Russia (Russian Empire) withdrew from World War 1 in early 1918 due to the Russian Revolution and the subsequent rise of the Bolshevik government led by Vladimir Lenin. The new Bolshevik government signed the Treaty of Brest-Litovsk, effectively ending Russia's involvement in the war.
During World War I, the Triple Alliance consisted of three major European nations: Great Britain, France, and Imperial Russia. Numerous other nations, small and large, were also associated with this alliance; however, in 1917, it was Imperial Russia that withdrew from the alliance and then, in early 1918, from all military involvement entirely.
Treaty of Brest-Litovsk
1917.
Russia withdrew from the war.
A war that involves many of the major countries of the world in direct battle and impacts almost every country in the world.