Columbia subject headings:
North Atlantic Treaty Organization--Foreign relations--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Ukraine--Foreign relations--NATO countries.
Ukraine--Foreign relations--Russia (Federation)
Ukraine--Politics and government--21st century.
Harvard subject headings:
European Union--Ukraine.
North Atlantic Treaty Organization--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Ukraine--Foreign relations--Europe.
Ukraine--Foreign relations--Russia (Federation)
Ukraine--Politics and government--21st century.
Princeton subject headings:
North Atlantic Treaty Organization--Foreign relations--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Ukraine--Foreign relations--North Atlantic Treaty Organization.
Ukraine--Foreign relations--Russia (Federation).
Ukraine--Politics and government--21st century.