The Ethnosocial identification actualizes the issue of interaction of population groups on both sides of the border in a global world. The issue of dual ethnic identification of residents of border regions, their acquisition of new features of the neighboring cultural environment, the formation of a special border identity is raised. Similar examples exist in various countries of the world, including the European Union, the United States of America, the People's Republic of China and the Russian Federation. Within the framework of the research, the author uses the following methods: historical, geopolitical and civilizational approaches, concrete historical, observation and generalization, systemic socio-political and ethnic analysis, synthesis. In the conclusions, he comes to the opinion that there is a need for a broad study of the issue of biethnors in the national sociological school, the actualization of this direction in our days.