Evolution of the United Nations Collective Security System

The author explores the collective security system of the United Nations and the problems it has faced over the last decades. Phenomena such as globalization, the end of the cold war, incorporation of new actors in international relations and ethnic confrontation, organized crime and other factors of transnational nature are among them. This has brought about complex changes in the work of the organization and has fostered a debate on the meaning of international security, both in government and in academic fields. On this matter, she highlights the prevailing positions and proposals. She further insists on the need to redefine the United Nations collective security system, taking into account historic experience, peacekeeping operations and the use of mechanisms such as preventive action to avoid conflicts.