US Rethinks Protection of Its Nuclear Sub Fleet

The US Navy is reassessing how it protects its ballistic missile submarines (SSBNs) as the rapid spread of inexpensive drones and portable precision weapons reshapes the threat landscape. Once considered relatively secure while in port, the submarines and their supporting shore infrastructure are now viewed as increasingly vulnerable to attacks by small uncrewed systems—a lesson reinforced by recent conflicts, particularly the war in Ukraine.

Ukraine Strikes Russian Sub with Underwater Drone – December 16th, 2025

Low-Cost Drones Pose High-Stakes Risk to Nuclear Submarines

US Navy officials are concerned that the same low-cost tactics used to strike high-value military assets could threaten strategic nuclear submarines during maintenance, transit, or while berthed at naval bases. In response, the Navy is exploring enhanced force protection measures, including improved counter-drone systems, stronger physical security, and upgraded defenses for submarine support facilities.

Black Sea Fleet Adapts to Ukraine’s Drone Threat

Russia is already adapting to the evolving threat. According to Business Insider, several Kilo-class submarines at the Novorossiysk naval base have been fitted with anti-drone cage structures to help protect against Ukraine’s growing long-range drone capabilities. The modifications, introduced after repeated Ukrainian attacks forced much of Russia’s Black Sea Fleet to relocate from Sevastopol, highlight how both sides are increasingly hardening high-value naval assets against emerging uncrewed threats.