What ended Russia's role in world war 1?

Russia's role in World War I effectively ended with the signing of the Treaty of Brest-Litovsk in March 1918. Following the Bolshevik Revolution in October 1917, the new communist government sought to withdraw from the war to focus on internal issues. The treaty resulted in significant territorial losses for Russia, ceding land to Germany and its allies, thereby solidifying Russia's exit from the conflict.