Russia’s stealth nuclear submarine’s secrets out, Ukraine claims

Ukraine’s defense intelligence agency, HUR, claims to have obtained sensitive engineering documents and operational details about Russia’s newest stealth nuclear-powered submarine, the Knyaz Pozharsky, a Borei-A (Project 955A) class ballistic missile submarine commissioned in July 2025. This vessel, one of the most modern in Russia’s naval fleet, carries Bulava ballistic missiles capable of striking targets up to 8,000 km away, each missile armed with up to 10 warheads. The submarine features advanced navigation, sonar, and stealth technologies, powered by a VM-5 pressurized water reactor, and displaces 24,000 tons submerged, making it larger than the U.S. Ohio-class submarines. The leaked documents reportedly reveal detailed technical specifications, crew operations, combat layouts, and internal issues such as a deformed radio beacon, along with investigation records and daily schedules of the crew. These insights could expose vulnerabilities and shortcomings in the Borei-A class, which is