The Royal Air Force intercepted two Russian aircraft off the Scottish coast, the UK Ministry of Defence said.
RAF Typhoons were scrambled after the Russian aircraft “entered the UK’s controlled zone of international airspace”.
The Russian planes were identified as TU-142 Bear F maritime reconnaissance and anti-submarine warfare aircraft.
The RAF aircraft are currently operating from Leuchars in Fife.
An MoD spokesman said monitoring of the controlled zone ensured safe passage for other aircraft, including civilian transatlantic liners.
The former Leuchars RAF base is now a British Army station, home to the Royal Scots Dragoon Guards.
However, the Typhoons have temporarily relocated from their base at RAF Lossiemouth while part of a runway is resurfaced.