The article describes the border treaty between Russia and China in the 19th century, the situation with the resettlement of Kazakhs who fled for various reasons at the beginning of the last century from the partition of Mongolia during the country's independence in the early 20th century. The need to clarify the relationship between irredentists and the diaspora in these states is discussed. Indeed, in modern Kazakhstani society, raising such a topic is of great importance in the formation of a positive attitude of the people towards a foreign brother.