File photo of the S-300 air defence system launching a missile during the International Army Games 2016 at the Ashuluk military polygon outside Astrakhan, Russia, August 7, 2016. REUTERS/Maxim Shemetov

File photo of the S-300 air defence system launching a missile during the International Army Games 2016 at the Ashuluk military polygon outside Astrakhan, Russia, August 7, 2016. REUTERS/Maxim Shemetov

File photo of the S-300 air defence system launching a missile during the International Army Games 2016 at the Ashuluk military polygon outside Astrakhan, Russia, August 7, 2016. Reuters/Maxim Shemetov

August 29, 2016 7:21 AM (UTC+8)