This research examines the causes of the inefficiency of international security regimes in the international system. The main research question is: Why have international security regimes, despite extensive efforts, faced significant challenges in achieving their objectives? The research hypothesis posits that the inefficiency of these regimes stems from conflicting interests and identities among major powers, particularly the United States, Russia, and China, as well as shifts in security perspectives that have complicated international cooperation. The aim of this study is to analyze the causes of the inefficiency of security regimes and propose solutions to enhance global cooperation in addressing emerging threats. The research employs a qualitative and descriptive-analytical methodology, utilizing credible academic sources and policy documents. The findings indicate that the differing identities and interests of major powers, geopolitical rivalries, and evolving security threats have diminished the effectiveness of security regimes. The conclusion of the research suggests that improving the efficiency of these regimes requires innovative diplomacy and the establishment of consensus among major powers on security principles and norms. Additionally, membership in security regimes should be carefully considered in light of national interests and security perspectives to avoid unnecessary securitization.