National delimitation in the Soviet Union refers to the process of creating well-defined national territorial units (Soviet socialist republics – SSR, autonomous Soviet socialist republics – ASSR, autonomous oblasts (provinces), raions (districts) and okrugs from the ethnic diversity of the Soviet Union and its subregions. The Russian term for this Soviet state policy is razmezhevanie (Russian: национально-территориальное размежевание, natsionalno-territorialnoye razmezhevaniye), which is variously translated in English-language literature as national-territorial delimitation, demarcation, or partition. National delimitation is part of a broader process of changes in administrative-territorial division, which also changes the boundaries of territorial units, but is not necessarily linked t