Ukrainian Intel Leaks Classified Data on Russia’s New Borei-A Nuclear Submarine Knyaz Pozharsky

Ukrainian Intelligence Acquires Comprehensive Data on Russia’s Newest Nuclear Submarine

The Ukrainian Defense Intelligence Directorate (HUR) has announced the acquisition of in-depth classified documentation related to the Russian Navy’s latest nuclear-powered ballistic missile submarine, “Knyaz Pozharsky.” A flagship of the Project 955A Borei-A class, the vessel reportedly entered service in July 2025 and currently operates out of Gadzhiyevo in the Murmansk region within Russia’s Northern Fleet.

Detailed Technical and Operational Documentation Leaked

According to the HUR’s August 3 statement, the obtained materials provide a rare glimpse into the inner workings of the Knyaz Pozharsky. The leaks allegedly cover a wide spectrum of sensitive data, including exhaustive crew lists detailing individual roles, qualifications, and fitness standards. Additionally, the documents encompass operational combat manuals, daily routines, and the submarine’s internal structure from a personnel perspective.

Technical assets seized in the leak extend to vessel schematics, survivability systems, and engineering protocols. Notably, documented procedures cover casualty evacuation, logistical cargo transfers, and towing operations. The trove also includes an official assessment of a deformed communications buoy, accompanied by a list of responsible organizations and the commission involved. Excerpts from the vessel’s daily schedule book further illuminate the operational cadence aboard the Borei-A class submarine.

Borei-A Class: Pillar of Russian Naval Deterrence

Commissioned under the supervision of Russian President Vladimir Putin, the “Knyaz Pozharsky” is the latest in Russia’s strategic push to modernize its submarine fleet. Construction commenced in 2016, with trial voyages in 2024 leading up to its 2025 induction as the fifth Borei-A class submarine—and the fourth in regular serial production.

Equipped to play a critical role in Russia’s nuclear deterrent, each Borei-A submarine is armed with 16 R-30 Bulava ballistic missile tubes. Each missile possesses the capability to deploy up to 10 independently targetable warheads, underscoring the class’s survivability and strategic reach. The vessel also boasts 533mm torpedo launchers, integrating conventional maritime defense alongside its nuclear mission.

Enhanced Stealth and System Upgrades

Refinements in the Borei-A design distinguish the Knyaz Pozharsky and her sisters from earlier variants. Modifications to hull shape, bow structure, and sail architecture were implemented to minimize acoustic detection and boost stealth performance. Alongside these structural advances, adjustments to the missile launch complex enhance weapon deployment capabilities, highlighting a trend toward increased survivability for Russia’s submarine force.

Ukrainian Analysis and Regional Implications

Ukrainian intelligence officials have signaled that the extensive documentation affords unprecedented insight, not only into the latest Russian submarine but also into the broader characteristics and limitations of the Borei-A class as a whole. The revelations are expected to inform assessments of Russia’s naval nuclear deterrent posture and could contribute to strategic recalibrations in the region.

This disclosure follows recent milestones in Russian naval modernization, including the delivery of the Yakutsk—an Improved Kilo-class (Project 636.3) diesel-electric submarine—completing the Pacific Fleet’s six-submarine program. Armed with Kalibr missiles and tailored for covert operations, these assets underscore Russia’s ongoing investments in undersea warfare amid heightened regional tensions.