NATO forces intercept Russian submarines training with undersea cable sabotage device near Svalbard

British, Norwegian and U.S. naval units intercepted Russian submarines conducting exercises near the Svalbard archipelago this spring, preventing the deployment of a device intended to disrupt undersea communication cables, officials said.

According to two Western officials who spoke on condition of anonymity, the operation was organized by Russia’s GUGI undersea warfare directorate and involved deep-sea submersibles simulating the use of the technology. The vessels were tracked, confronted and eventually left the area without completing the exercise.

Norway’s defence minister, Tore Sandvik, said the joint operation sent a clear message that covert activity in the High North would be detected and met with consequences. British officials confirmed that the exercise was part of a broader effort to monitor and protect subsea infrastructure after earlier incidents involving Russian activities in European waters.

The cables in question include two 1,400-kilometre fibre-optic lines linking Svalbard to mainland Norway at depths of up to 2,700 metres. They carry substantial satellite data from the SvalSat ground station, which is part of an international near-space network.

Russia’s defence ministry did not comment on the incident, and the Kremlin has repeatedly denied conducting sabotage operations against NATO members. U.S. intelligence analysts have expressed concern that Russia could test NATO’s collective defence commitments, including Article 5, by targeting such infrastructure in a conflict scenario.

The encounter follows a series of reported Russian violations in European airspace and maritime domains, as well as heightened NATO monitoring initiatives such as the Baltic Sentry system and the Nordic Warden patrols aimed at protecting critical undersea assets.