The plane appears to go down (although no fire or smoke is visible) but the burning objects in the sky appear to be flares dropped by the plane. Was it hit before the video started or am I missing something?
The puff of smoke after the chaff is dropped is likely anti-aircraft gungire scoring a hit. It looks like a flameout, meaning the fire in the turbojet's combustion chamber was extinguished. There's likely not enough energy (speed + altitude) for recovery.