As posted Turkey has yet again white anted what could have been a viable US strategy and compromised it's own national security for the sake of populist opinion polls.
There are suggestions that Russia may have prevented this deal because of its reported deal with the Devil to swap Idlib for Afrin. Maybe Putin changed his mind following an apparent flip flop deal between Tillerson and Erdogan. Who knows?
The games Russia and Iran are playing with the US presence in the East need to stop. Instead of focusing on fighting a proxy war with the US near Dier Ezzor and splitting the Eastern YPG from the Western YPG Putin and Khamenei should now allow the Syrians themselves to discuss and agree on a viable future that will hold the country together in one way or another.
