In a calm social situation, ethnic identity is often not actualized, then with a change in the national-state identification framework, the role of ethnicity increases. It performs a protective function, being a kind of reaction to the instability of society as a more ancient and stable form of information structuring of the world. The Russian frontier is represented by the south of the Tyumen Oblast, and the Kazakh frontier by the North Kazakhstan. The Russian population of this territory has consistently assimilated the representatives of many peoples living in the studied region (Khanty, Mansi, Komi, Ukrainians, Poles, Kazakhs, Tatars, etc.), being an example of a complex metisny population with the predominant Russian dominant. On the example of the speech of local Kazakhs, Tatars and Russians, the author shows how the transformation takes place within the modern Eurasian language identity of the Russian-Kazakhstan borderland. The Tyumen region has aroused interest among researchers for quite a long time as a multicultural, polyethnic and multilingual education with a complex structure, in which various ethnic groups and diasporas play an important role, therefore the issue of in-depth analysis of the evolution of languages and state regulation of their functioning is extremely relevant. At the same time, this work sets the analysis vector for other border areas of the Russian Federation and Kazakhstan (Saratov, Orenburg, Astrakhan, Kurgan regions, Altai Krai, etc.) in various aspects. We have proposed for the first time the periodization of the stages of the evolution of the functioning of languages in the Russian-Kazakhstan frontier. It should be recognized that the territory of the modern Russian-Kazakhstan border area from antiquity experienced intense linguistic stress due to the influence of the movement of peoples, branches of the Great Silk Road, historically established migrations, therefore the population of the region was initially formed in a situation of polyethnicity. © 2018, Universidad del Zulia. All rights reserved.