08.02.22
[Marc Weller is Professor of International Law and International Constitutional Studies at the University of Cambridge and Editor of the Oxford Handbook on the Use of Force in International Law.]
The international rules on the use of force are simple. Force may never be employed as a means of international policy. Force is only available by way of self-defence, if specifically authorized by the UN Security Council or, arguably, when strictly necessary to avert an overwhelming humanitarian emergency.