As Assad's forces slowly recapture Idlib province, the millions of Syrians that fled there fear being murdered by them.

Assad and Russia have systematically bombarded medical facilities there.

It appears that Turkey tried to reinforce Khan Sheikhoun a week ago, and was stopped by air attacks.

The situation is complicated by the fact that the rebel forces in Idlib, which have Turkey's support, are the Islamist militants that used to control most of Syria and used to confiscate the arms and supplies that the US provided to non-Islamist militants.