Syria - Turkey and Turkey's Allies in Syria

The Ukraine war has given Turkey much more leverage. The November 19th bombing in Istanbul that Turkey and Erdogan has attributed to the YPG. These are Kurdish forces in Syria that are allied with the Turkish Workers Party the PKK which Turkey sees as a mortal enemy. America has promised that it will not withdraw under President Biden but it might be that the United States has to make some concessions to Turkey on this.