Erdenetsogt Gochoosuren, Ganbileg Alagdaa. THE ISSUES OF ENSURING SECURITY OF THE STATE BORDER THROUGH SUBSURFACE BORDER PROTECTION. IJITSS [Internet]. 2025 Mar. 28 [cited 2026 May 1];(1(45). Available from: https://rspublisher.org/index.php/ijitss/article/view/3173