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Portugal Drops Plans for F-35 Citing U.S. Political Uncertainty
(theaviationist.com)
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I doubt Russia would want to buy warplanes with a US kill switch.
Once this kill switch stuff keeps popping up:
https://theaviationist.com/2025/03/10/f-35-kill-switch-myth/
TL;DR: There is no kill switch per se (as in flip it and brick the thing), but a huge dependency on logistics, services and systems that operators outside the US have no influence over. That in turn will cause the plane - while still flyable - to be grounded over time as it cannot be maintained, rearmed and operated effectively anymore.
At the end the effects are the same of a kill switch