The book "Language and Nationality Borders in Europe" by Leon Dominian is a study of the relationship between language groups and national identities in the broad cultural context of Europe. In the book, the author reveals the influence of language on the formation of national communities, and also examines how various language communities perceive and interact with each other in the conditions of modern European cross-border relations. Through analysis of historical and contemporary factors, Dominian illuminates the complex relationships between languages, cultures, and nationalities, helping the reader to better understand the role of language in the formation of national identity in Europe.