Earlier quoted context omitted.
No such kill switch exists, the US stopped providing electronic warfare intelligence that made the jets more survivable. The stoppage of all military aid was significantly more damaging.
The kill switch first reported wasn't for jets, but was for HIMARS[0], which stopped receiving data for strikes. But everyone viewed this kill switch as a way broader than HIMARS, and rightfully so. It will be foolish to assume that the USA has the capacity to turn HIMARS targeting capacity off, literally incapacitating the system which was built in the 90s, but somehow won't be able to kill switch a F35... This is d…
Or why Europeans didn't insist to get same version (probably no leverage). Well any next armament purchase by Europe thats smarter than a lead bullet should have full code delivery with all build processes. Still not 100% perfect scenario but least minimum acceptable.