If potus can turn them into paperweight on his morning ego whim while not even being in indirect conflict with US but rather directly fighting US mortal sworn enemy, they are worse than useless and no sane country would want them even for free, a trojan horse of sort.

4th (4.5th) generation that reliably works is something dependable, even if not top notch. Something tells me that if you took F-35 to russian-held Ukraine airspace, it may not survive that long anyway, its not like its unhittable as Iran showed. What decides that war is anyway drones in numbers and their skilled use, not anymore artillery, tanks or endless armies of poor illiterate fuckers.