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

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

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

August 22, 2016 5:32 AM (UTC+8)