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A picture taken on October 29, 2015 shows Syrians inspecting damaged buildings following a reported air strike by Syrian government forces in the rebel-held area of Douma, east of the capital Damascus. Nearly 600 people have been killed in Russian air strikes in Syria nearly a month into Moscow's campaign, two-thirds of them opposition fighters, a monitor said. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY (Photo credit should read SAMEER AL-DOUMY/AFP/Getty Images)

A picture taken on October 29, 2015 shows Syrians inspecting damaged buildings following a reported air strike by Syrian government forces in the rebel-held area of Douma, east of the capital Damascus. Nearly 600 people have been killed in Russian air strikes in Syria nearly a month into Moscow's campaign, two-thirds of them opposition fighters, a monitor said. AFP PHOTO / SAMEER AL-DOUMY / AFP / SAMEER AL-DOUMY        (Photo credit should read SAMEER AL-DOUMY/AFP/Getty Images)