"Starting from the Leninist thesis on the possible success of the revolution in a single country, even one that was economically underdeveloped but constituted the weakest link of the imperialist system, our Party asserted that the Vietnamese revolution was closely related to the revolution in the metropolitan country but was not subordinate to it. Moreover, owing to the concrete conditions of Vietnam and the world in the era of imperialism, it was possible for socialist revolution to triumph in Vietnam before it would in many a developed capitalist country."
January 1, 1970
https://en.wikiquote.org/wiki/Tr%C6%B0%E1%BB%9Dng_Chinh