If people in Russia "support" the war, it is because the bourgeoisie control the flow of information and education in the country and uses it to instill beliefs in the proletariat that benefit their rule. The ruling class of every country in the world disseminates ideas of nationalism using its vast resource to ensure the population consents to being cannon fodder for "national interests". In reality the working class shares no interests with its ruling class or "nation" at all.