The article attempts to study the features of the implementation of international treaties and the problem of fragmentation of international law. The impact of international law on national law is carried out through domestic mechanisms and procedures that make it possible to transform and update international norms in the national sphere. Without these mechanisms and coordination of international and national law, effective implementation of international obligations becomes impossible.

The research methodology uses general scientific research methods - historical and logical, analysis and synthesis; private scientific methods - logical-formal, comparative-legal, system analysis.

The purpose of the study is to identify the features of the implementation of international treaties and the problems of fragmentation of international law.

It is concluded that the mechanism of implementation of international treaties on the national territory depends on the internal legal order of each State. In most cases, for the implementation of an international treaty, national legislation must be consistent with its provisions. Specific procedures and formalities may vary depending on the domestic legislation of each State. Preventing fragmentation in the field of international law is a complex task, contingent upon the need for achieving coordination and establishing collaboration among international courts, relevant national structures, and States. This process necessitates a comprehensive and interconnected approach aimed at ensuring uniformity and coherence in the application of international legal norms. In order to attain this objective, measures such as enhancing coordination and information exchange among diverse bodies, utilizing established norms and precedents, and fostering open and constructive dialogue among them may be implemented.