Columbia subject headings:
Hybrid warfare--Russia (Federation)
National security--Ukraine.
Russia (Federation)--Foreign relations--Ukraine.
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Russia (Federation)
Harvard subject headings:
Hybrid warfare.
National security--Ukraine
Russia (Federation)--Foreign relations--Ukraine--21st century.
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Russia (Federation)--21st century.
Ukraine--Politics and government--21st century.
Princeton subject headings: