Columbia subject headings:
Harvard subject headings:
Black Sea Lowland (Ukraine)--Foreign relations--21st century--Congresses.
Black Sea Lowland (Ukraine)--Politics and government--21st century--Congresses.
Caucasus, South--Foreign relations--1991---Congresses.
Caucasus, South--Politics and government--1991---Congresses.
National security--Caucasus, South--Congresses.
National security--Ukraine--Black Sea Lowland--Congresses.
Sustainable development--Caucasus, South--Congresses.
Sustainable development--Ukraine--Black Sea Lowland--Congresses.
Princeton subject headings:
Black Sea Lowland (Ukraine)--Foreign relations.
Caucasus, South--Foreign relations.
National security--Caucasus, South.
National security--Ukraine--Black Sea Lowland.
Sustainable development--Caucasus, South.
Sustainable development--Ukraine--Black Sea Lowland.