UN Secretary General Ban Ki Moon has accused Russia and the Syrian government of war crimes in the siege of Aleppo. With each side blaming the other, it's a crisis likely to face the next President of the United States.
People look at the sky fearing an airstrike in the rebel-held al-Myassar neighbourhood of Aleppo, Syria, September 27, 2016. (Abdalrhman Ismail/Reuters)