Columbia subject headings:
Harvard subject headings:
Neutrality--Europe--History--21st century.
Neutrality--History--21st century.
Nonalignment--Europe--History--21st century.
Nonalignment--History--21st century.
Security, International--Europe--History--21st century.
Princeton subject headings:
National security--Europe.
Neutrality--Europe.
Nonalignment--Europe.