“We have no indication that this is possible,” Belgian Chief of Defence Gen. Frederik Vansina

“It is not possible to ‘remotely control’ or ‘block’ the F-35A fighter jets, for example by external intervention in the electronics,” according to … the Swiss Department of Federal Defense. “Switzerland does not need consent if it wants to use its weapons systems or guided missiles for its own defense. It can do this autonomously, independently, and at any time.”

https://www.twz.com/air/you-dont-need-a-kill-switch-to-hobble-exported-f-35s