The International Law Commission's 2019 Draft Conclusions on Peremptory Norms of International Law assert that States have an obligation to cooperate to end serious breaches of peremptory norms. International law provides scarce guidance, however, regarding how States are expected to fulfil that obligation. This article seeks to elaborate: first, whether the prohibition of crimes against humanity and the ‘basic rules’ of international humanitarian law are peremptory norms; second, what States are required to do to fulfil their obligation to cooperate; and third, how States might utilise the General Assembly as a forum through which to fulfil that obligation.
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