Abstract: European security is undergoing an accelerated transformation process, driven by changes in the global geopolitical environment, technological developments and the reconfiguration of relations between great powers. In the context of intensifying strategic competition, pressures on the international order and the proliferation of hybrid threats, the European space is faced with the need to redefine its instruments and mechanisms for defense and cooperation. The article analyzes the main trends that are reshaping Europe's security architecture, highlighting the role of regional and global actors, the dynamics of Euro-Atlantic institutions and the implications for medium-term stability. The study offers an integrated perspective on emerging challenges and possible directions for strategic adaptation to strengthen European resilience. Keywords: European Security, Geopolitics, Hybrid Threats, Euro-Atlantic Cooperation, Strategic Resilience, Operational Adaptation