The impact of the Russian Revolution in 1917 on World War I was profound. The revolution led to the abdication of Czar Nicholas II and ultimately resulted in the establishment of a Communist government under Vladimir Lenin. In the aftermath, Russia withdrew from the war by signing the Brest-Litovsk Treaty in March 1918, which allowed Germany to concentrate its forces on the Western Front. This shift destabilized the Allied forces as they faced renewed pressure from the Central Powers, significantly altering the war's dynamics and contributing to the war's eventual outcome.