While this Definition of Aggression has often been cited by opponents of conflicts such as the 1999 Kosovo War and the 2003 Iraq War, it has no binding force in international law. The doctrine of "Nulla poena sine lege" means that, in the absence of binding international law on the subject of aggression, no penalty exists for committing acts in contravention of the definition. It is only recently that heads of state have been indicted over acts committed in wartime, in the cases of Slobodan Milošević of Serbia and Charles Taylor of Liberia. However, both were charged with war crimes, i.e., violations of the laws of war, rather than with the broader offence of "a crime against international peace" as envisaged by the Definition of Aggression.