Abstract: The object of the study is the linguistic uncertainty of Azerbaijanis who live in Russia. The subject of the study is the causes of the phenomenon of language insecurity among graduates of Azerbaijani schools who received education in Russian in Azerbaijan, as well as the main reasons of a social and individual nature that contribute to its manifestation. The article describes the main reasons that have become the source of language insecurity among graduates of Azerbaijani schools who have received general secondary education in Russian in Azerbaijan. The authors of the article investigated the existing methods of teaching Russian in schools in Azerbaijan, the main problems that arise during the teaching of students, as well as obstacles that may affect the process of formation of language skills and knowledge of students. In order to study the causes of language insecurity among graduates of Azerbaijani schools in the course of communication while in the Russian Federation, we conducted a series of interviews with graduates of a number of schools in the capital of the country, in the city of Baku. The definition of the concept of language insecurity is given and the main reasons of both social and individual nature are shown, contributing to the manifestation of language insecurity in a number of students who have graduated from Azerbaijani schools with the Russian language of instruction.