After setting up a wide range of actors and institutions forming the counter-terrorism policy, which largely falls within the realm of the European Union's Police and Judicial Co-operation in Criminal Matters pillar, the Union continues its efforts to expand its counter-terrorism actions to the sphere of its Common Foreign and Security Policy (known as CFSP). The process of integrating counter-terrorism elements to CFSP can reflect the changing thoughts concerning European security behind the construction of CFSP. The counter-terrorism arrangements under CFSP framework can also reveal some truth - partially if not fully- about why it is so difficult for CFSP to become a real EU "common policy" in external affairs.