This chapter will address the role of certain European and Euro–Atlantic organizations in European security, in light of recent developments and with a view to the future. It is necessary to emphasize that this analysis will thus necessarily remain partial and lop-sided. It is beyond the scope of this chapter to take into account the role played by universal international organizations in conflicts on the “old continent.” Neither will it take into account other regional organizations such as the Council of Europe, or those institutions that have been established in the former Soviet area and which have played practically no role in conflict management (understandably, given the strong hegemonic dominance of Russia in the decision-making of organizations such as the CIS, CSTO or the EaEU).