Modern Threats to the National Security of Ukraine Related to Incomplete Legal Formalization Process of Ukrainian State Border

The border issue has become particularly urgent for Ukraine since 2014 with the beginning of military aggression by the Russian Federation, the illegal annexation of the Autonomous Republic of Crimea and the city of Sebastopol, as well as the temporary occupation of the part of Ukraine's sovereign territory in the Donetsk and Luhansk regions. The problem of the legal formalization of the Ukrainian-Russian state border requires closer examination in the context of complex relations between two states. This article seeks to analyze the current situation of legal formalization of the Ukrainian state border with neigh bouring countries and highlights the main threats to Ukraine's national security arising from the incomplete process of formalizing the Ukrainian state border with the Russian Federation. It was revealed that the incomplete process of legal formalization of the state border threatened to lose the state part of sovereignty, territorial integrity in sovereign territory. It is concluded that there is a potential threat of escalation of border conflicts and military clashes in Ukraine's border regions, as well as at Ukraine's borders, and the spread of extremist, terrorist, and separatist demonstrations on Ukraine's state border.