Columbia subject headings:
Communist countries--Relations--Soviet Union.
Russia (Federation)--Relations--Ukraine.
Soviet Union--Ethnic relations.
Soviet Union--Relations--Communist countries.
Ukraine--Relations--Russia (Federation)
Harvard subject headings:
Communist countries--Relations--Soviet Union.
Russia (Federation)--Relations--Ukraine.
Soviet Union--Ethnic relations.
Soviet Union--Relations--Communist countries.
Ukraine--Relations--Russia (Federation)
Princeton subject headings: