The article discusses how the European Union's military and political cooperation developed from 1945 to 1992. It explores the reasons behind the collaboration, key figures involved, and the challenges faced in coordinating member states' positions on foreign and security policies. By analyzing international relations theories and historical events, the author shows how the EU's Common Foreign and Security Policy was established through the efforts of various European countries. The research highlights the complexities and contradictions in the process of building military and political collaboration within the EU.