The article explains and investigates the causes for the construction of Daryal fortifications, as well as their function in the system of international political ties in the Caucasus region over time. The Daryal fortress, located in the Daryal Gorge of the Central Caucasus, was of great importance for ensuring political, economic and military security in the North Caucasus and Transcaucasia. The political forces exercising control over it received a considerable number of advantages nec-essary to carry out their domestic and foreign policies. Maintaining the fortress, the garrison serv-ing in it, as well as the road passing through the Daryal Gorge required large financial expendi-tures. Despite this, the construction of fortresses in the Daryal Gorge and other locations of the Central Caucasus was extremely useful in defending the rich and commercially developed repub-lics of Transcaucasia against incursions by nomadic tribes from the north. The defense system as a link between Europe and Asia has existed and functioned for many centuries, which confirms its importance in ensuring security and creating positive dynamics in the development of the North Caucasus and Transcaucasian regions.