The UK has accused Russia of conducting covert attack submarine operations in and around its waters, which were successfully repelled by its armed forces.
The Ministry of Defence claimed British aircraft and warships identified a Russian attack submarine entering international waters in the High North several weeks ago and tracked its activity around the clock.
The operation in the North Atlantic was said to have been part of a 'Russian bluff', while other specialist vessels conducted 'nefarious activity' near critical underwater infrastructure.
Prime Minister Keir Starmer said the government would not shy away from taking action and exposing Russia's destabilising activity that seeks to test their resolve.
The UK said its campaign of overt action was intended to ensure the Russian units knew that they were being monitored and were no longer covert as planned.
Both the GUGI units and the Akula class submarine are said to have since 'retreated home, having failed to complete their operation in secrecy'.
The target is believed to have been subsea fibre optic cables essential for all digital communications, with over 99 per cent of international data traffic, including voice calls and internet data – underpinning global banking, trade, and communications.
The Royal Navy deployed a Type 23 frigate, HMS St Albans, RFA Tidespring and Merlin helicopters to track the attack submarine as it operated near British territorial waters.
Working alongside RAF P8 aircraft, the submarine was tracked 24/7 in an operation carried out with allies.
The UK has kept both naval vessels and aircraft ready to respond should Russian vessels return.