Who took Russia out of World War 1?

Russia exited World War I primarily due to the Bolshevik Revolution in 1917, which led to a change in government. The new Bolshevik leadership, under Vladimir Lenin, sought to withdraw from the war to focus on consolidating power and addressing internal issues. This resulted in the signing of the Treaty of Brest-Litovsk in March 1918, which formally ended Russia's involvement in the conflict.