A Royal Navy attack submarine surfaced close to a Russian spy ship off the UK coast in an extraordinary warning to stop spying on British undersea cables, the defence secretary has revealed.

John Healey, in a highly unusual statement to MPs, said the incident happened in November but the research vessel, called Yantar, then returned to UK waters this week.

To counter the latest spying mission, he said he changed the navy’s rules of engagement to enable British warships to get closer to the vessel and better track its activities.

In a message to Russian President Vladimir Putin, Mr Healey said: “We see you. We know what you are doing. And we will not shy away from robust action to protect this country.”

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Image:
Defence Secretary John Healey. Pic: PA

It is very rare for the UK to reveal details about the movement of its top secret fleet of nuclear-powered submarines. The Ministry of Defence has not said which of its Astute-class boats was involved.

A decision to tell parliament that one of the submarines had surfaced next to the surveillance vessel underlines the extreme seriousness that the UK views the Russian activity back in November and again this week.

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Mr Healey said the Russian ship had been used for gathering intelligence and mapping the UK’s critical underwater infrastructure.

The UK and its NATO allies are increasingly concerned about the risk that President Putin’s country poses to offshore cables, pipelines and other infrastructure.

Describing the most recent sighting, the defence secretary said Yantar entered the “UK exclusive economic zone about 45 miles off the British coast” on Monday.

He said that for the last two days, the Royal Navy has deployed Type 23 frigate HMS Somerset and patrol ship HMS Tyne to “monitor the vessel every minute through our waters”.

Navy rules of engagement changed

The defence secretary said he changed the navy’s rules of engagement so “our warships can get closer and better track the Yantar”.

He said the ship “has complied with international rules of navigation” and has since sailed into the North Sea.

Russia has said Yantar is an oceanographic research ship which is operated by its defence ministry.

RFA Proteus monitoring Russian ship Yanter in November 2024. 
Pic: Royal Navy/PA
Image:
RFA Proteus monitoring Russian ship Yanter in November 2024. Pic: Royal Navy/PA

Second incident in months

Mr Healey told the House of Commons it was the second time Yantar had entered British waters in recent months, after it was detected in November “loitering over critical undersea infrastructure”.

Back then, the Royal Navy nuclear-powered submarine was used to warn off the spy ship.

‘Monitoring its every move’

RAF maritime patrol aircraft, minehunter HMS Cattistock, offshore patrol vessel HMS Tyne and surveillance ship RFA Proteus were also deployed “to shadow Yantar’s every movement”.

Mr Healey said: “I authorised a Royal Navy submarine, strictly as a deterrent measure, to surface close to Yantar to make clear that we had been covertly monitoring its every move.

“The ship then left UK waters without further loitering and sailed down to the Mediterranean.”

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Mr Healey warned: “Russia remains the most pressing and immediate threat to Britain, and I want to assure the House and the British people that any threat will be met with strength and resolve.”

P-8 Poseidon and Rivet Joint spy planes will join the NATO operation to protect undersea cabling in the Baltic Sea, while RFA Proteus has also been deployed to monitor offshore infrastructure.