High Quality Content by WIKIPEDIA articles! The legitimacy of the NATO bombing of the Federal Republic of Yugoslavia has been subject to question by many bodies and individuals from the time of the action continuing to this day. The key basis governing the legality of any act of war is international law. In this particular case, a course of action is also bound by other foundations such as the NATO charter and the UN charter, both of which were drafted in accordance with preexisting international regulation. As such, the issue has been shady at times with proponents of both viewpoints citing particular legislation that substantiate their claims on whether the war was or was not legal.