Columbia subject headings:
Harvard subject headings:
European Union countries--Military policy--Congresses.
National security--European Union countries--Congresses.
National security--Law and legislation--European Union countries--Congresses.
Security, International--European Union countries--Congresses.
Security, International--Law and legislation--European Union countries--Congresses.
Princeton subject headings:
European Union countries--Military policy--Congresses.
National security--European Union countries--Congresses.
National security--Law and legislation--European Union countries--Congresses.
Security, International--European Union countries--Congresses.
Security, International--Law and legislation--European Union countries--Congresses.