Leon Trotsky was part of the Bolshevic party during the early years of the USSR. After Lenin (the previous leader of the USSR) died in the 1920's, Trotsky and Joseph Stalin both fought for the power of ruling the USSR. Stalin won, and then exiled Trotsky, afraid that he might organize a military coup to overthrow Stalin.
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Trotsky was expelled from the country first to Turkey, then France, then Norway, finally to Mexico. In 1940 he was assassinated by KGB ordered by Stalin. A Russian agent plunged the pointed end of an ice ax into Trotsky's skull killing him. The assassin was able to reach Trotsky by pretending to be interested in some of the articles written by Trotsky.
The Revolution in Russia ended Russia's involvement
russia
If you are referring to WW1, then russia left early
Bolshevik revolutionary leader was Leon Trotsky
Trotksy certainly played a key role as People's Commisar [Minister] for War and managed to persuade many former Tsarist officers to stay in Russia and join the Red Army.