The goal of this study is to determine specific features of the Common Foreign and Security Policy (CFSP) as a tool of strengthening European integration. As a conclusion, one can note that one of the important vectors of CFSP is developing effective foreign policy of the EU and promote conflict prevention. CFSP significance for strengthening the EU can be demonstrated by the recent policy developments, such as the Permanent Structured Cooperation (PESCO) and the Coordinated Annual Review on Defence (CARD). Therefore CFSP can be regarded as a vital tool of strengthening European integration.