This is what the source text to the picture says
Unit: 25th ZIAP
Serial: 21 (KX248, Merlin XX engine No.87711)
The plane with the original British serial No. KX248 get a white number 21 on the rudder and red stars on the fuselage and on the upper and bottom of the wings.
In was served with 25th ZIAP and based at Adju-Kabul, Azerbaijan in early 1944. On 21st February 1944 2nd Lt.Lepilin force landed due to engine failure at Saratchally airfield and the aircraft was withdrawn.