The document summarizes the development of the Common Foreign and Security Policy (CFSP) of the European Union. It discusses how the CFSP emerged from informal cooperation in foreign policy among EU members in 1970. The Maastricht Treaty in 1993 formally established the CFSP to allow the EU to speak with one voice in foreign affairs. Key developments included the establishment of the High Representative for CFSP and bodies to coordinate foreign policy. However, unanimity among members and their freedom to pursue independent foreign policies have limited the effectiveness of the CFSP.