Ratification of the Rome Statute or Declaration under Article 12(3)?

There are two ways that a State such as Ukraine can accept the jurisdiction of the International Criminal Court (‘ICC’) pursuant to the Rome Statute (‘Statute’): the State in question may either become a State Party to the Statute through ratification or accepting the Court’s jurisdiction on ad hoc basis with respect to a given situation by lodging a Declaration under article 12(3) of the Statute.