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Syrians shout slogans during a rally in the rebel-held northwestern city of Idlib, late on December 12, 2016, in support of residents of the rebel-controlled part of Aleppo which is under regime siege. Syrian troops were poised to recapture all of second city Aleppo on December 13, in what would be the biggest blow to rebels since they launched their uprising in 2011. / AFP / Omar haj kadour (Photo credit should read OMAR HAJ KADOUR/AFP/Getty Images)

Syrians shout slogans during a rally in the rebel-held northwestern city of Idlib, late on December 12, 2016, in support of residents of the rebel-controlled part of Aleppo which is under regime siege.
Syrian troops were poised to recapture all of second city Aleppo on December 13, in what would be the biggest blow to rebels since they launched their uprising in 2011. / AFP / Omar haj kadour        (Photo credit should read OMAR HAJ KADOUR/AFP/Getty Images)