The Royal Navy has completed a five-day operation to shadow a Russian task group as it made its way up the English Channel and into the North Sea.
The four Russian vessels were closely monitored by three Navy ships and two helicopters.
HMS Sutherland and her Merlin helicopter led the effort.
"Our ship's company remain determined to uphold the integrity of our sea lanes and will maintain a vigilant watch," Lieutenant Commander George Blakeman, HMS Sutherland's weapon engineer officer said.
"It's vitally important the Royal Navy continues to demonstrate its presence and commitment to the integrity of our territorial waters and this tasking is a clear example of that."
Patrol ship HMS Mersey, tanker RFA Tideforce and a Wildcat helicopter from 815 Naval Air Squadron joined the operation.
The group of Russian vessels sailed from the Bay of Biscay after a deployment in the Mediterranean.
"Working with our French and Norwegian allies, these [Russian] units were monitored on their transit north from the Mediterranean," Commander Tom Weaver, Commanding Officer of HMS Sutherland said.
The Russian task force comprised of Slava-class cruiser RFS Marshal Ustinov, Udaloy-class destroyer RFS Admiral Kulakov and their support vessels Silva and Vyazma.
Cover image: HMS Sutherland shadowing Russian vessels RFS Marshal Ustinov and Vyazama (Picture: Royal Navy).