The UN Charter and customary law contain significant ambiguities concerning the prohibition of enforcement measures by regional organizations. This fact – coupled with practical necessity – appears to have been responsible for the failure of the UN to condemn the unauthorized use of force by regional organizations in Liberia and Sierra Leone. These cases and legal doctrine suggested increasing regional autonomy in this field. Although reactions to Operation Allied Force in Kosovo cooled the enthusiasm of those who wished for the legitimization of such actions, evidence suggests that under certain circumstances unauthorized regional enforcement measures may at least avoid condemnation.