The US-backed "rebels" are in fact Islamists or Islamist terrorists (often from foreign countries such as Saudi Arabia) and are also backed by the head-chopping Islamist terrorist-supporting, terrorist-funding Saudi dictators. It's a fact that ISIS and al-Quaida (called al-Nusra in Syria) received US weapons, whether the US intended these UN-designated terrorist groups receive these weapons or not. Their (USA's) proxies or "moderate rebels" beheaded a 12-year-old boy in Aleppo not long ago. The Islamist terrorists embedded themselves among civilians in eastern Aleppo, and every day for more than two years they fired rockets into civilian areas in govt-controlled western Aleppo where 1.5 million civilians live. They targeted schools and hospitals with their rockets and shells. The terrorists held civilians, including women and children, hostage in eastern Aleppo and used them as human shields, which is a war-crime under international law.