Defence Secretary John Healey has issued a stark warning to Vladimir Putin after a Russian spy ship was detected operating near UK waters.”We see you, we know what you are doing and we will not shy away from robust action to protect this country,” Healey told MPs.Healey revealed the Russians have been using the ship for “gathering intelligence and mapping the UK’s critical underwater infrastructure”.In November, the Yantar was detected “loitering over UK critical undersea infrastructure”, prompting a decisive response from British forces.”I authorised a Royal Navy submarine, strictly as a deterrent measure, to surface close to the Yantar to make clear that we had been covertly monitoring its every move,” the Defence Secretary said.The submarine is believed to have been one of Britain’s Astute-class nuclear-powered attack boats.Following the encounter, the Russian vessel departed UK waters and sailed towards the Mediterranean.The Yantar has now returned to the North Sea, having entered the UK exclusive economic zone approximately 45 miles off the British coast on Monday.LATEST NEWS:’Accept responsibility!’ Ellie Costello grills Tory MP on ‘number of failings’National inquiry into Bradford rape gangs BLOCKED by Labour in fear of becoming ‘the next Rotherham’REVEALED: The scandalous climate bill that will give Labour UNCHALLENGED power to pursue net zeroRoyal Navy vessels HMS Somerset and HMS Tyne have been deployed to monitor the Russian ship’s movements.The warships have been tracking the vessel’s every move through British waters for the past two days.”The foreign ship Yantar is currently in the North Sea having passed through British waters,” Healey told MPs.So far, the Defence Secretary noted that the Russian vessel has been complying with international rules of navigation.In response to the Yantar’s return, Healey has implemented new rules of engagement for Royal Navy vessels.The Defence Secretary confirmed he had amended the protocols to allow British warships to better understand the movement of the Russian vessel.”I changed the Royal Navy’s rules of engagement so that our warships can get closer and better track the Yantar,” Healey told MPs.He emphasised the vessel’s intelligence-gathering capabilities, saying: “Let me be clear, this is a Russian spy ship used for gathering intelligence and mapping the UK’s critical underwater infrastructure.”