In our imperialist times most socialists throughout the world are members of nations that oppress other nations and strive to extend that oppression. That is why our “struggle against annexations” will be meaningless and will not scare the social-patriots in the least, unless we declare that a socialist of an oppressor nation who does not conduct both peacetime and wartime propaganda in favour of freedom of secession for oppressed nations, is no socialist and no internationalist, but a chauvinist! The socialist of an oppressor nation who fails to conduct such propaganda in defiance of government bans, i.e., in the free, i.e., in the illegal press, is a hypocritical advocate of equal rights for nations!

Vladimir Lenin, The Revolutionary Proletariat and the Right of Nations to Self-Determination (circa 1915)