In principle, collective security is designed on a common understanding that peace and security is indivisible in which the load of order-keeping should be shared among all members of the collective security institution. The League of Nations and its heir, the United Nations, were created to achieve international security through collective measures; however, both institutions suffered from member countries’ lack of necessary political will and resource commitment to make the collective security system work under different circumstances. This problem has been largely evident in addressing security problems in developing regions, particularly in Africa. The western powers (U.S., Britain, France) have less interest in sharing responsibility to enforce collective security system in Africa. Western nations have clearly elevated their national security imperatives to a higher level of importance over their obligation to the indivisibility of peace and collective security. Under such circumstance, there seems to be no alternative but that collective security should rely heavily on Africans themselves under the auspices of the newly established African Union (AU). African Union has undergone structural, doctrinal, and institutional changes to better handle security problems in the continent. Obviously young and weakly developed, AU regional security capacity proved that it is incapable of resolving the diverse and complex nature of conflict by itself. The widespread conflict in Africa has indeed pushed AU to over-commit itself beyond its capacity. Therefore, it will be necessary in the future for the AU to seek more support for collective security form the UN, Western powers, African regional security alliances and so-called African anchor states such as South Africa and Nigeria.