Columbia subject headings:
Europe--Foreign relations.
National security--Europe.
Terrorism--Europe--Prevention.
Transnational crime--Law and legislation.
Transnationalism.
Violent crimes--Europe.
Harvard subject headings:
Peace-building, European.
Security, International--European Union countries
Terrorism--Prevention--Government policy--European Union countries.
Princeton subject headings:
Europe--Foreign relations.
National security--Europe.
Terrorism--Europe--Prevention.
Transnational crime--Law and legislation.
Transnationalism.
Violent crimes--Europe.