Syrian Civil Defence members evacuate a toddler from the rubble of buildings destroyed following Russian air strikes a day earlier on the northwestern city of Idlib, on May 31, 2016. (Photo by Omar Haj Kadour/AFP Photo)





Syrian civil defence volunteers help a boy out of the rubble following a reported attack by Syrian government forces on May 30, 2016, in the Tariq al-Bab neighbourhood in the northern city of Aleppo. (Photo by Ameer Alhalbi/AFP Photo)





A man walks past damaged buildings in the rebel-held area of Deraa, Syria May 24, 2016. (Photo by Alaa Al-Faqir/Reuters)





A civilian walks past damaged buildings in the rebel-held area of Deraa, Syria May 24, 2016. (Photo by Alaa Al-Faqir/Reuters)





A damaged minaret of a mosque is pictured in the rebel-held area of Deraa, Syria May 24, 2016. (Photo by Alaa Al-Faqir/Reuters)





A man drives a motorbike past a damaged minaret of a mosque in the rebel-held area of Deraa, Syria May 24, 2016. (Photo by Alaa Al-Faqir/Reuters)





Boys ride a carriage pulled by a horse in Aleppo, Syria May 26, 2016. (Photo by Abdalrhman Ismail/Reuters)





Men walk near a damaged building in Aleppo's rebel held al-Fardous district, Syria May 26, 2016. The graffiti reads in Arabic reads: “Smile to piss off your enemy”. (Photo by Abdalrhman Ismail/Reuters)





A boy holds a funnel while refuelling a vehicle, in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 26, 2016. (Photo by Khalil Ashawi/Reuters)





A boy rides a bicycle near displayed containers in a petrol shop, in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 26, 2016. (Photo by Khalil Ashawi/Reuters)





A man pours fuel in a petrol shop, in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 26, 2016. (Photo by Khalil Ashawi/Reuters)





People inspect a site hit by an airstrike in the rebel held area of Aleppo's al-Sukari district, Syria, May 30, 2016. (Photo by Abdalrhman Ismail/Reuters)





Men are seen covered with dust at a site hit by an airstrike in the rebel held area of Aleppo's al-Sukari district, Syria, May 30, 2016. (Photo by Abdalrhman Ismail/Reuters)





A woman stands near a man covered with dust at a site hit by an airstrike in the rebel held area of Aleppo's al-Sukari district, Syria, May 30, 2016. (Photo by Abdalrhman Ismail/Reuters)





A boy carries bread as he makes his way through rubble of a site hit by an airstrike in the rebel held area of Aleppo's al-Sukari district, Syria, May 30, 2016. (Photo by Abdalrhman Ismail/Reuters)





Men gesture as they ride horses during a parade for Arabian horses in the rebel held area of Damascus's Eastern Ghouta suburbs, Syria May 30, 2016. (Photo by Bassam Khabieh/Reuters)





A man wearing traditional clothes takes part in a parade for Arabian horses in the rebel held area of Damascus's Eastern Ghouta suburbs, Syria May 30, 2016. (Photo by Bassam Khabieh/Reuters)





A man pushes an old man on a wheel chair near rubble of damaged buildings in the rebel held town of Nasib, Deraa countryside, Syria, May 30, 2016. (Photo by Alaa Al-Faqir/Reuters)





A man inspects a damaged house in the rebel held town of Nasib, Deraa countryside, Syria, May 30, 2016. (Photo by Alaa Al-Faqir/Reuters)





Boys walk near rubble in the rebel held town of Nasib, Deraa countryside, Syria, May 30, 2016. (Photo by Alaa Al-Faqir/Reuters)





A rebel fighter and civil defence members carry a dead body removed from under debris after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, late May 30, 2016. (Photo by Khalil Ashawi/Reuters)





Civilians and civil defence members look for survivors at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, late May 30, 2016. (Photo by Khalil Ashawi/Reuters)





Civilians and civil defence members carry an injured woman on a stretcher at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, late May 30, 2016. (Photo by Khalil Ashawi/Reuters)





Civilians and civil defence members look for survivors at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, late May 30, 2016. (Photo by Khalil Ashawi/Reuters)





Civil defence members carry an injured man into an ambulance after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, early May 31, 2016. (Photo by Khalil Ashawi/Reuters)





A civil defence member gestures to a fellow member near an excavator as they look for survivors at a site damaged after Russian air strikes on the Syrian rebel-held city of Idlib, Syria, early May 31, 2016. (Photo by Khalil Ashawi/Reuters)





Homeless children rest on the sides of a fountain near the Central Bank of Syria in Damascus, Syria May 31, 2016. (Photo by Omar Sanadiki/Reuters)





A woman runs holding a walkie-talkie towards a damaged site after an airstrike on the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 31, 2016. (Photo by Khalil Ashawi/Reuters)





Dust covered men walk in an area damaged by an airstrike on the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 31, 2016. (Photo by Khalil Ashawi/Reuters)





A woman inspects a damaged site after an airstrike on the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 31, 2016. (Photo by Khalil Ashawi/Reuters)





A man covered with dust sits on a street following a reported air strike by Syrian government forces in the rebel-held neighbourhood of Sukkari in the northern city of Aleppo on May 30, 2016. (Photo by Baraa Al-Halabi/AFP Photo)