About the book: 2021 / The book offers a modern scientific view of the problem of the formation of Ukrainian-Russian relations in a turning point in history, when centuries-old social orders, deep-rooted traditions and There was a search for new fundamental principles, political, legal, state models of community life and activities of the two great Slavic peoples. Based on voluminous documentary and factual material, the processes of creating the foundation for strengthening, developing full-scale fruitful cooperation and the simultaneous emergence of difficult negative trends, which subsequently led to serious contradictions and unforeseen collisions, are gradually, in detail traced, analyzed, and assessed. Attempts are made to lead the reader to understand the conclusions and lessons from the shared experience. Considerations are expressed regarding the level of historiographical development of the problem and the prospects for further research. For all those interested in Russian history. The publishing layout of the book is saved in PDF A4 format.