This article discusses current issues of practical implementation of the legislation of the Republic of Kazakhstan on the termination and change of citizenship. The author notes an increase integration processes is in the modern world and on the territory of the Commonwealth of Independent States, which affect the migration and legal status of citizens, with a changing status. The basis for the study in the Constitution of the Republic of Kazakhstan, the Law on Citizenship in ratified international treaties. The purpose of the work is to identify legal and organizational problems in the termination and change of citizenship with the development of appropriate recommendations based on international standards. The analysis shows the need to further improve national legislation in various aspects, including clarifying procedural standards, identifying «significant obligations», and filling gaps in ensuring human rights. Possible methods of solving these problems through the coordination of actions of state bodies, strengthening international cooperation and harmonization of legal standards within the CIS are considered. The results of the study are of interest both for the theory of law and for the practice of its application. They contribute to increasing the legal protection of citizens and the optimal use of the possibilities of integration processes.