ENThe Polish-Russian and Lithuanian-Russian borderland is an area with a significant history and experience in the development of cross-border relations. Until February 2022, the neighborhood with the Konigsberg region of the Russian Federation represented an opportunity for the development of the border areas in question. After the beginning of Russian aggression against Ukraine, the neighborhood with the Konigsberg region is considered more in terms of security threats. The purpose of this article is to clarify the conditions of Polish-Russian and Lithuanian-Russian cross border relations. The author's attention was focused in particular on those factors of cross-border relations that resulted from the policies and interests of local authorities on the one hand, and on the other hand from Polish-Russian and Lithuanian-Russian relations implemented by the central authorities. Keywords: cross-border relations, Königsberg region, Lithuanian-Russian borderland, Polish-Russian borderland. [From the publication]