About the book: 1973 / The monograph is devoted to one of the important but little-studied problems in the history of international relations in Central and Eastern Europe during the period of late feudalism. It examines Russia's struggle for access to the Baltic Sea and the influence of the relationship between Russia and the Polish-Lithuanian Commonwealth on the course and results of this struggle. The book allows us to answer the question of what factors led to the establishment in the 17th century. Swedish domination in the Baltic, which caused enormous damage to the interests of both Poland and Russia.