We'll see. I think the US is going to leave syria long before any partition is real. Suffering setbacks is pretty different than full on retreat. The Al Tanf situation was full abandonment of the southern (Jordan fed) effort, Deir Ezzor was a heavy loss, and now a boxed in kurdistan has little hope of survival.
The ukie orcs will likely keep at the donbass, but it won't be with much more than a flippant approval from DC. There will certainly be no ground forces crossing demarkation lines, they can't even field a battalion let alone an actual offensive. Their air force has been finished for years and there are no more old unwanted planes to toss on their scrap heap.
The empire has lost. Now its a face saving retreat followed by an incredible inflationary dollar.