The UK Ministry of Defence said on 9 April 2026 that British naval and air assets had tracked and forced a Russian attack submarine and associated vessels from the Main Directorate of Deep Sea Research (GUGI) to withdraw from UK waters. According to the statement, the submarine entered international waters in the High North several weeks earlier and was monitored 24/7 by a Type 23 frigate, HMS St Albans, RFA Tidespring and RAF P8 aircraft. The UK worked with allies, including Norway, to identify other GUGI units near critical underwater infrastructure. Prime Minister Keir Starmer and Defence Secretary John Healey praised the forces’ actions and said the UK would maintain readiness to respond if Russian vessels returned.
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