The Royal Navy has monitored nine Russian warships as they sail through Scots waters.
A flotilla including a surfaced submarine, a destroyer, a corvette and a patrol ship, along with support ships, has been watched closely over the last two weeks.
Navy chiefs say the Russians have been sailing in the English Channel, Celtic Sea and off the West Coast of Scotland.
First Sea Lord Admiral Tony Radakin said: "This is why the Royal Navy is at sea every day, protecting the UK and our interests.
"Even with the pressures of Covid, we remain at short notice to respond to threats both in home waters and around the world.
"Despite the increase in Russian activity, both on the surface and underwater, we are always ready to respond."
Type 23 frigate HMS Northumberland, based at Devonport, watched the movements of Udaloy-class destroyer the Vice-Admiral Kulakov as it sailed north-west of the Outer Hebrides, off the west coast of Scotland.
Patrol ship HMS Severn was on duty in the English Channel and Dover Strait, where it shadowed a surfaced Kilo-class submarine, the Stary Oskol, the corvette Boikiy, patrol ship Vasiliy Bykov and support ships.
Severn was also on patrol as the Vice-Admiral Kulakov sailed through the Channel.
For some of the operation, the Russian ships sheltered from bad weather within the Baie de Seine, northern France, where Severn was joined by allied French navy ships and aircraft.
Commander Philip Harper, Severn's commanding officer, said: "In very challenging conditions with rough weather, Severn and several other British and allied ships have spent 20 days ensuring that Russian transiting warships remain under our watchful eyes."
HMS Lancaster joined Severn tracking Steregushchiy-class corvette Boikiy in the Channel and using its Wildcat helicopter to gather intelligence.
HMS Tyne, HMS Richmond and HMS Kent jointly escorted the same group of Russian ships as they operated in the Celtic Sea.
The task group were joined by RAF Typhoon and F-35s jets, plus tankers RFA Tideforce and RFA Tiderace.
Last month fast jets from RAF Lossiemouth in Moray chased off Russian submarine hunter planes spotted in British airspace over the North Sea.
