Measures taken by Members in the exercise of this right of self-defense shall be immediately reported to the Security Council and shall not in any way affect the authority and responsibility of the Security Council under the present Charter to take at any time such action as it deems necessary in order to maintain or restore international peace and security. Nothing in the present Charter precludes the existence of regional arrangements or agencies for dealing with such matters relating to the maintenance of international peace and security as are appropriate for regional action, provided that such arrangements or agencies and their activities are consistent with the Purposes and Principles of the United Nations. The bottom line is that the UN Charter generally prohibits the use of force to solve international disputes, but nations still have the right to defend themselves both individually and collectively. This means they do not have to wait for the other nation to shoot first. Nations may also use military force as authorized by the UN, usually the Security Council, to restore international peace and security in circumstances where they may or may not be threatened themselves.
Several nations disagree with the legality of the U.S. action.
Such action may include demonstrations, blockade, and other operations by air, sea, or land forces of Members of the United Nations. Iraq provided the required notification and the formal cease-fire came into affect. Among the provisions to which Iraq agreed was to eliminate all their weapons of mass destruction and allow international inspection and verification. Basically, we are just continuing the 1991 Gulf War. They would obviously veto any Resolution that authorized or approved the attacks.