International Court of Justice, Accordance with international law of the unilateral declaration of independence in respect of Kosovo (2010)
“ The Court observes that it is not required by the question it has been asked to take a position on whether international law conferred a positive entitlement on Kosovo unilaterally to declare its independence or, a fortiori, on whether international law generally confers an entitlement on entities situated within a State unilaterally to break away from it. Indeed, it is entirely possible for a particular act – such as a unilateral declaration of independence – not to be in violation of international law without necessarily constituting the exercise of a right conferred by it. ”
