"Hi, you need to install this critical feature upgrade or your F35 may fly unstable paths and kill your pilot during combat"
...
"yea, we did disable 99% of the functionality, come back when the trade negotiations finish"
alternatively:
"we found problems. You can't have them until you agree to trade terms. PS they make for unstable flight. your pilots may day in combat"
alternatively:
"if you refuse to agree to our trade terms, then we refuse to tell you about critical subsystem diagnostics and your airframe may not be servicable"
&c &c &c.
I would not call any of these an in-flight kill switch. I would call all of them varying degrees of remote software control. albiet across maintenance functions.
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