Participation of international organizations in security and peace reform

With the start of globalization and the third millennium, international peace and security have gradually lost their traditional westphalian notion and have become complicated. The nature of threats against international peace and security has also spread to political, economic, social and environmental aspects as well as military ones. The paper examines topical issues of the international organization role in maintaining peace and security: the development of the mechanism for cooperation in relation to “non-traditional” security threats, as well as issues of mandate and coordination of the international organization activities to maintain peace, security and order. In the paper we pay attention to main problems of legal regulation, threat of weapons of mass destruction, as well as humanitarian and environmental instability. The evolution of international peace and security notion and new interpretations of threats are the most manifested matters of international organizations.