The Treaty that officially announced Russia's withdrawal from World War I was:

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The Treaty of Brest-Litovsk, signed on March 3, 1918, was the peace treaty between the new Bolshevik government of Soviet Russia and the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire) ending Russia's participation in World War I. The treaty ceded large portions of Russian territory to the Central Powers and marked Russia's withdrawal from the war.

The Treaty That Officially Announced Russia's Withdrawal from World War