Columbia subject headings:
Harvard subject headings:
Belarus--Foreign relations--Ukraine.
Donet︠s︡ʹka oblastʹ (Ukraine)--History, Military--21st century.
Mercenary troops--Belarus--21st century.
Ukraine Conflict, 2014-
Ukraine--Foreign relations--Belarus.
Princeton subject headings:
Ukraine Conflict, 2014---Participation, Belarusian.