The recent battle in the Deir Ezzor oil fields showed strong US support for the Kurds.
The Kurds will not get their own state however Syria was forced to negotiate with Kurds if they want the oil- which they do.
It also led Russia to negotiations, having shown it’s support for Turkey but in a failure.
So everyone is happy.
I expect Turkey to be satisfied to occupy some area north of Afrin city. For a while anyway.
Everyone just uses the Kurds, for their own ends, when ANYONE making a strong partnership with the Kurds - whether others object or not - would be getting the most long term strong (as in never give up) partner they could. Why? For the Kurds its existential - securing their unique existence as a people.