First Russian War (6 March 1930-6 February 1933 (peace treaty with Ukraine and Poland) or 29 March (ending of military actions in Russian Empire)) (also known as Russian Civil War) was a military conflict between Tsarists, Oppositionists and national minorities seeking independence. The war has claimed lives of 400.000 combatants, but ensuing terror, ethnic cleansing, famine and plague have killed three to five million people, making it the deadliest conflict of 20th century.