The Kurds are viewed as a US proxy. The US policy is bringing together Iran, Turkey, Iraq and Syria. The Kurds will be the losers. Russia has advised them to negotiate with Damascus, but they preferred the promises of the West.
What can the US do? They can use their soft power in Turkey and Iran; they could even use Jihadi groups.
Could these four countries cut off the supply routes the US needs to continue to steal Syria’s oil and occupy northeast Syria illegally?
Turkey and Iran are talking to Russia. China has expressed interest in becoming involved in the Astana process.