Local (Particular) Customs, International Court of Justice and the Problem of State Consent

The article examines the problems of local (particular) international customs, which until recently remained on the periphery of the interests of domestic researchers. It is noted that modern ideas about particular customary international law were largely formed by several decisions of the UN ICJ made at different times, in which he briefly addressed these issues. In the decision on the dispute between Costa Rica and Nicaragua, the ICJ finally eliminated the differences between universal and local customs in terms of expressing consent to the binding nature of customary norms, thereby depriving supporters of a consensual approach to the formation of customary norms of one of their key arguments.