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The big wave has hit the established international security functions of the United Nations and the present system of the world order. The termination of the cold war in the early 1990's has, however, gave UN a chance of revolutionary possibility in order to rebirth of UN's international security functions. UN began to grope the new effective legal-political-military tools to develop it's effective international security functions. This creative efforts produced the inconceivable disagreement with a super-power: the prevail of U.S., and brought UN's international security functions face to face with a new difficult situation in the late 1990's. After the new millennium, any one could not help recognizing the limitation of new collaboration in UN's the post-cold war initiative for international security. The sever tactics around the hegemonic leadership between US and UN:P5 of Security Council, has reached the climax towards international chaos around Iraq crisis after 911.The coalition of willingness by US with friendly and a little positively reluctant states was the very answer to the risky alternative: CW. Whether CW was the challenge or the germination at the vanguard of our era for UN's international security system is pending even in post-Iraq War. This joint study by collaborate discipline of international law, international politics and military science tries to propose some questions, and to reveal some initiatives for these questions. "Coalition" in the wide sense was one model of operations of joint/combine military operation from historical point of view. Especially, this strategy style was always taken in the large-scale war. However, the strategy by Coalition has developed with peculiar background in the given ago and subject based on that. This dissertation makes mention of the warlike issue in the background and operations on modern Coalition. Keeping that in mind, it brings particular issues and, clearing up them, it attempts all possible answers. Concretely, it is discussed as command of operations for winning by operations of coalition that each country's expeditionary force of different systematic culture carries out, modeling the Gulf War and focusing on the command and control organization.