A still image, taken from video footage and released by Russia's Defence Ministry on August 18, 2016, shows a Russian Sukhoi Su-34 fighter-bomber based at Iran's Hamadan air base dropping off bombs in the Syrian province of Deir ez-Zor. Ministry of Defence of the Russian Federation/Handout via REUTERS TV ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.

A still image, taken from video footage and released by Russia’s Defence Ministry on August 18, 2016, shows a Russian Sukhoi Su-34 fighter-bomber based at Iran’s Hamadan air base dropping off bombs in the Syrian province of Deir ez-Zor. Ministry of Defence of the Russian Federation/Handout via REUTERS TV ATTENTION EDITORS – THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.

A still image, taken from video footage and released by Russia's Defence Ministry on August 18, 2016, shows a Russian Sukhoi Su-34 fighter-bomber based at Iran's Hamadan air base dropping off bombs in the Syrian province of Deir ez-Zor. Ministry of Defence of the Russian Federation/Handout via REUTERS TV ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.

August 18, 2016 9:27 AM (UTC+8)