The Russian Ministry of Defense's Borei-class submarine blueprints and documents are suspected of being leaked.

On January 15, 2026, hackers leaked the blueprints and documents of the Borei-class nuclear submarines, claiming that these files contained state secrets of the Russian Ministry of Defense (MoD) regarding the Borei-class (Project 955) nuclear submarines. The leak included a Microsoft Word document (.doc), a PDF blueprint, and related images, allegedly exposing technical details of the nuclear propulsion system, technical drawings, and maintenance protocols.