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Somewhere, somehow, there is a box which does the encryption and then pushes a button (connects a relay) which says ‘go”. If you have the physical missile, warhead, and box - and if you have *some* capability in mechanicals and computers (which Ukraine does) and if you have 20 years to figure it out, I suspect this would not be an insurmountable problem.
I suppose clever people might be able to circumvent all the protections put around nuclear warheads. I'm pretty sure I've seen at least one or five movies where that was the main part of the plot. But keep in mind that of ALL things in the world, nuclear warheads tend to have the best protections of all. Even better protections than electronic money has.