The huge propaganda campaign about east-Ghouta is certainly not over humanitarian concern or over adherence to some legal rules of war. Last year the U.S. destroyed Raqqa with more than 31,000 artillery rounds and a large air campaign and killed more than 3,200 civilians. It even destroyed the water pipeline to Raqqa that supplied the inhabitants of the city – a clear war crime. Back then the UN requested a ceasefire to evacuate civilians. The U.S. rejected that out of hand. It latter let the remaining Islamic State fighters escape from Raqqa and is now retraining them for further attacks on the Syrian state.
http://www.moonofalabama.org/2018/02/syria-the-unsc-mandated-ceasefire-will-not-hold.html