Аннотация:The intensive integration and cross-border regionalization observed at many interstate borders inEurope in recent decades have made the concept of barriers at the state borders extremely popular. Low bor-der barriers are rightly perceived by researchers as one of the necessary conditions for intensive cross-bordercooperation, and as its regular outcome. However, when assessing barrier properties, many researchersfocused exclusively on the state border line itself, ignoring the transport and communication properties of theadjacent territories. The authors of the article propose their own, combined method of assessment of trans-port accessibility and barrier capacity of the border, tested on the Russian-Kazakhstan and Russian-Belaru-sian sections of the border. The essence of the method consists in calculating the transport accessibility ofborder crossing points for the populated areas of border regions, taking into account the configuration of thetransport network. The advantage of the method is that it allows to compare borders of varying degrees ofopenness and to obtain an idea of what part of the territory and population on both sides of the border can beinvolved in cross-border relations. The study showed that due to the almost complete absence of border con-trols, the Russian-Belarusian border has higher transport permeability and better preservation of the trans-port network. All this ensures a high level of transport accessibility for the border population. In the Russian-Kazakhstan border region, where the number and density of border crossing points are lower, and the state ofthe network of border roads is much worse, and a relatively high level of transport accessibility of the borderis characteristic of a small number of regions. With the reduction in the number of checkpoints in the 2000s,the length of “deadlocked” borders has increased: they are borders that are difficult or inaccessible to the localpopulation. A comparative analysis of the population’s cross-border practices and calculations of transportaccessibility showed that the transport accessibility of the border and the neighbor there, barriers and perme-ability of the border are of a potential nature, that is, they do not account for cross-border contacts in them-selves. The specific territorial context, the fundamental socioeconomic and political characteristics and thecurrent situation, as well as historical and cultural factors also influence the realization of the potential for theborder and neighbor accessibility