Is it too late to cancel F-35 purchase?

As you may have heard, the US is nit against preventing us from using our weapons against Russia, even if we were attacked. This is more or less what they are doing now with Ukraine if they do not fold to their extortion plan: https://www.reuters.com/business/us-could-cut-ukraines-access-starlink-internet-services-over-minerals-say-2025-02-22/

Is it too late to cancel the purchase of the F-35? It was chosen to be able to carry US nukes but that is never going to happen now. Moreover, some equipments can be disabled by the US if they wanted to (revoke GPS keys, do not give code for programming/unlocking missiles...), reason why Israel has redone the whole electronics of their F-35s.