Royal Air Force Typhoons took off from the Lossiemouth airbase, north east Scotland, on a Quick Alert Response (QRA).
An RAF Airbus Voyager KC3 tanker was also scrambled from Brize Norton airbase in Oxfordshire.
The Quick Reaction Alert, or QRA, is the RAF’s state of readiness where fighter jets can be scrambled within minutes to meet or intercept aircraft which give cause for concern.
A statement by the Ministry of Defence said: “Two Typhoons were scrambled from RAF Lossiemouth this morning as part of the RAF’s Quick Reaction Alert in response to two Russian aircraft entering the UK’s airspace.
“Both aircraft have now returned safely to RAF Lossiemouth.”