For example, if tomorrow Morocco were to declare war on France, India on England, Persia or China on Russia, and so forth, those would be "just," "defensive" wars, irrespective of who attacked first, and every socialist would sympathize with the victory of the oppressed, dependent, unequal states against the oppressing, slaveowning, predatory "great" powers.
Socialists must not only demand the unconditional and immediate liberation of the colonies without compensationand this demand in its political expression signifies nothing else than the recognition of the right to self-determination; they must also render determined support to the more revolutionary elements in the bourgeois-democratic movements for national liberation in these countries and assist their uprising
We welcome the close alliance of Moslem and non-Moslem elements. We sincerely want to see this alliance extended to all the toilers of the East. Only when the Indian, Chinese, Korean, Japanese, Persian, and Turkish workers and peasants join hands and march together in the common cause of liberation
by V. I. Lenin (for the Second Congress of the Communist International) (June 5, 1920)
[...] the Communist International should advance and theoretically substantiate the proposition that with the aid of the proletariat of the advanced countries, the backward countries can pass over to the Soviet system and, through definite stages of development, to communism, without going through the capitalist stage.
by V. I. Lenin (July 26, 1920)
Second Congress of the Communist International
In his article assessing the Communist Manifesto ninety years after it was written, Leon Trotsky pointed out:
[T]he Manifesto contains no reference to the struggle of colonial and semi-colonial countries for independence. To the extent that Marx and Engels considered the social revolution 'in the leading civilized countries at least' to be a matter of the next few years, the colonial question was resolved automatically for them, not in consequence of an independent movement of oppressed nationalities but in consequence of the victory of the proletariat in the metroploitan centers of capitalism. The questions of revolutionary strategy in colonial and semi-colonial countries are therefore not touched upon at all by the Manifesto. Yet these questions demand an independent solution.[...] The movement of the colored races against their imperialist oppressors is one of the most important and powerful movements against the existing order and therefore calls for the complete, unconditional, and unlimited support on the part of the proletariat of the white race. The credit for developing revolutionary strategy for oppressed nationalities belongs primarily to Lenin. (our emphasis)