INTERNATIONAL CRIMINAL LAW AND NATIONAL LAW COOPERATION BETWEEN STATES IN COMBATING INTERNATIONAL CRIMES

Nataliia  Kaminska; Tetiana Babkova; Ivan  Krasnytskyi; Nadiia  Melnyk; Vladyslav  Boiko

Nataliia Kaminska V. M. Koretsky Institute of State and Law, National Academy of Sciences of Ukraine https://orcid.org/0000-0002-7239-8893
Tetiana Babkova Western Ukrainian National University https://orcid.org/0009-0009-6678-3515
Ivan Krasnytskyi Educational and Scientific Institute of Law and Law Enforcement Activities, Lviv State University of Internal Affairs https://orcid.org/0000-0002-5529-7636
Nadiia Melnyk Lviv State University of Internal Affairs https://orcid.org/0000-0001-8521-9180
Vladyslav Boiko State University «Kyiv Aviation Institute» https://orcid.org/0009-0005-7202-7071

Keywords: Criminal law. War crimes. International humanitarian law. International criminal law. Cooperation of states.

Abstract

The article examines the interaction between international criminal law and national legal systems in combating international crimes. It reviews approaches to implementing international humanitarian and criminal law domestically, analyzes institutional forms of cooperation in investigating war crimes, crimes against humanity, genocide, and aggression, and identifies trends in international criminal justice amid contemporary security challenges. The study is based on the analysis of international legal instruments, including the Rome Statute and the Geneva Conventions, judicial practice, scientific literature, and comparative legal analysis of national implementation models. Special attention is given to the principle of complementarity and the role of the International Criminal Court in ensuring accountability. The article demonstrates that effective state cooperation requires harmonized legislation, extradition mechanisms, international legal assistance, and joint investigative teams. Integrating national jurisdiction with international prosecution enhances accountability and strengthens global legal security, contributing to the advancement of international justice and the rule of law.

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