UK and Norway Deter Russian Submarine Threat to Undersea Infrastructure

"Any attempt to damage cables and pipelines would not be tolerated and would have serious consequences."
— UK Defence Secretary John Healey

The United Kingdom and Norway conducted a joint military operation earlier this year to deter Russian submarines operating near critical undersea infrastructure in the North Atlantic and High North regions.

The operation involved Royal Navy and Royal Air Force assets, as well as Norwegian naval and air units, monitoring a Russian attack submarine and two specialist submarines. The Russian vessels departed the area after more than a month. No damage to underwater cables or pipelines has been reported.

Timeline and Operation Details

British aircraft and warships initially identified a Russian Akula-class attack submarine entering international waters in the High North several weeks prior to the operation's public disclosure. UK service personnel determined this submarine was likely a diversion.

The UK collaborated with allies, including Norway, to identify and monitor additional Russian undersea naval units from the Main Directorate of Deep Sea Research (GUGI) operating near critical undersea infrastructure.

The UK and its allies initiated overt monitoring actions to ensure the Russian units were aware of being tracked. Following these actions, both the GUGI units and the Akula-class submarine returned to their home bases.

Assets Deployed

• Royal Navy: HMS St Albans (Type 23 frigate), RFA Tidespring (support tanker), and Merlin helicopters tracked the attack submarine near British territorial waters.
• Royal Air Force: P8 maritime patrol aircraft participated with 24/7 tracking and deployment of sonobuoys across thousands of miles.
• Norway's defence ministry: Deployed a P-8 maritime patrol aircraft and a frigate.

The Russian submarines did not enter Britain's territorial waters but operated within its Exclusive Economic Zone (EEZ), which extends 200 nautical miles from shore, and the waters of British allies.

Vessels and Capabilities Involved

Russian vessels involved in the operation included:

• One Akula-class attack submarine
• Two specialist submarines from Russia's Main Directorate for Deep Sea Research (GUGI)

According to UK officials, GUGI is a Russian military program designed to develop capabilities for surveying underwater infrastructure during peacetime and potentially damaging or destroying it during conflict.

Statements from Officials

UK Defence Secretary John Healey stated that British forces, supported by allies including Norway, tracked and deterred the activities of the Russian vessels. He indicated that the operation was made public to ensure Russian President Vladimir Putin was aware of their detection.

Norwegian Defence Minister Tore Sandvik confirmed that Russia's operation occurred in and near Norwegian and British maritime areas.

UK Prime Minister Keir Starmer stated the government's commitment to protecting the British public from the economic impact of Russian aggression and to defending national and economic security.

Broader Context

The UK government has reported a 30% increase in Russian naval activity near British waters over the past two years.

NATO allies have increased their presence in the North Atlantic and Baltic Sea following a series of incidents involving damage to power cables, telecom lines, and gas pipelines since Russia's 2022 invasion of Ukraine. Most of these incidents have been attributed to civilian ships.

New Joint Patrols

In December, Britain and Norway announced new joint naval patrols specifically aimed at protecting undersea cables. This initiative involves a combined fleet of at least 13 warships. The agreement includes a £10 billion deal for Norway to acquire at least five British-made frigates to operate jointly with eight British ships along NATO's northern flank.

Defence Spending

• The UK is allocating an additional £100 million to support P8 submarine-hunting aircraft.
• The Atlantic Bastion program, based on Strategic Defence Review recommendations, is transforming the Royal Navy's submarine hunting capabilities through autonomous systems and advanced sensors.
• These efforts are part of the largest increase in UK defence spending since the Cold War, aiming to reach 2.6% of GDP by 2027, with £270 billion invested in defence during the current Parliament.

Related Incident: Black Sea Air Interception

On an unspecified date in April 2026, the UK Ministry of Defence reported that two Russian Su-35 and Su-27 fighter jets intercepted an unarmed Royal Air Force RC-135 Rivet Joint surveillance aircraft over the Black Sea. The aircraft was conducting a routine flight in international airspace in support of NATO operations.

According to the Ministry:

• A Russian Su-35 flew close enough to trigger the British aircraft's automatic emergency systems, disabling the autopilot.
• During a separate intercept, a Russian Su-27 conducted six high-speed passes within six meters of the Rivet Joint's nose.

The flight was completed successfully, and the RAF crew was praised for remaining calm and professional.

UK Defence Secretary John Healey described the actions as "dangerous and unacceptable" behavior that creates a risk of accidents and escalation, but stated the incident would not deter the UK's commitment to defend NATO and its allies. UK officials formally condemned the incidents to the Russian Embassy in London.

The Ministry noted that this is the most dangerous interception of a Rivet Joint since 2022, when a Russian aircraft fired a missile near a British plane in the same region.