Columbia subject headings:
Intervention (International law)--Congresses.
National security--Europe--21st century--Congresses.
North Atlantic Treaty Organization--History--Forecasting--Congresses.
Post-communism--Europe--Congresses.
Security, International--21st century--Congresses.
Harvard subject headings:
Intervention (International law)--Congresses
National security--Europe--21st century--Congresses.
North Atlantic Treaty Organization--History--Congresses.
Post-communism--Europe--Congresses.
Security, International--21st century--Congresses.
Princeton subject headings: