You would think the alliance between the Kurds and Assad was a result of the Trump withdrawal going by the western media. I reckon the PKK was planning this move well in advance and this Jerusalem post article om August 6 2018 pretty much has played out. PKK was backdooring the US in my view, to continue their ongoing dispute with Turkey.https://www.jpost.com/Opinion/Another-miscalculation-by-the-PKK-in-Syria-564272