Once again spotted is Chinese KJ-500 Airborne Early Warning and Control System (AEW&C) aircraft.  KJ-500 AEW&C is based on Y-9 transport aircraft just like ZDK-03 Airborne Early Warning and Control System exported to Pakistan Air Force, but it carries new generation three sided fixed active electronically scanned array (AESA) Radars to provide continuous 360º radar coverage. 

China employs Y-9 transport aircraft for medium tactical transport, ISR (intelligence, surveillance and reconnaissance) missions, maritime patrol, anti-submarine warfare and Airborne Early Warning and Control System