After the rather blunt Turkish statement yesterday .."the US must choose either Turkey or the Kurds"...the envoy better be carrying a command to cease their advance to close the Azaz corridor and stop capturing Arab towns and focus fully on attacking IS and not doing joint operations with Assad and Putin....

Otherwise the US has driven Turkey out of NATO...not a good move....

Exclusive#US envoy composed of 20 vehicles crossed #Syria-n border towards #Rmelan military base near #Qamishli.