A captured Japanese A6M2 "Zeke", re-painted in Chinese Air Force (CAF) colors, with Chinese serial 'P5016'. The aircraft directly behind the 'Zeke' is a P-43 "Lancer" flown by the CAF.
The aircraft are probably at Kunming--because of the 23 Fighter Group P-40 in the background on the right.
(information provided by Tony Strotman)