“Imperialism means the progressively mounting oppression of the nations of the world by a handful of Great Powers; it means a period of wars between the latter to extend and consolidate the oppression of nations; it means a period in which the masses of the people are deceived by hypocritical social-patriots, i.e., individuals who, under the pretext of the ‘freedom of nations’, ‘the right of nations to self-determination’, and ‘defence of the fatherland’, justify and defend the oppression of the majority of the world’s nations by the Great Powers.
That is why the focal point in the Social-Democratic programme must be that division of nations into oppressor and oppressed which forms the essence of imperialism, and is deceitfully evaded by the social-chauvinists and Kautsky. This division is not significant from the angle of bourgeois pacifism or the philistine Utopia of peaceful competition among independent nations under capitalism, but it is most significant from the angle of the revolutionary struggle against imperialism. It is from this division that our definition of the ‘right of nations to self-determination’ must follow, a definition that is consistently democratic, revolutionary, and in accord with the general task of the immediate struggle for socialism. It is for that right, and in a struggle to achieve sincere recognition for it, that the Social-Democrats of the oppressor nations must demand that the oppressed nations should have the right of secession, for otherwise recognition of equal rights for nations and of international working-class solidarity would in fact be merely empty phrase-mongering, sheer hypocrisy. On the other hand, the Social-Democrats of the oppressed nations must attach prime significance to the unity and the merging of the workers of the oppressed nations with those of the oppressor nations; otherwise these Social-Democrats will involuntarily become the allies of their own national bourgeoisie, which always betrays the interests of the people and of democracy, and is always ready, in its turn, to annex territory and oppress other nations.”
— V. I. Lenin, The Revolutionary Proletariat and the Right of Nations to Self-Determination, 1915