The monograph is devoted to the study of the process of implementation of the Rome Statute of the International Criminal Court into national legislation. Doctrinal sources and research methodology, concepts, prerequisites for adoption and legal nature of the Rome Statute, concepts and forms, methods and models, constitutional and legal principles of ensuring its implementation in Ukraine and other post-Soviet and European countries are analyzed. The draft Law of Ukraine "On Ukraine's Cooperation with the International Criminal Court" has been developed, which defines the competent state authorities of Ukraine responsible for cooperation with the ICC, as well as the forms of providing mutual legal assistance in the process of such cooperation. It was noted that the state policy of Ukraine in this area should be systematic and consistent, scientifically based, reflect the national interests of the state, be aimed at ensuring the rights and freedoms of a person and a citizen according to generally recognized democratic standards.