I actually don't think there's much cause to deviate course over the next 4 years. I'd be shocked if any allies broke out by 2029 (maybe Ukraine has an ace in the hole, I don't know but it seems fanciful), and while the trust may be eroded in a big way, extended deterrence is still valuable.
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Not overnight, but long term.
I just don't think pinky promising not to cheat again is going to work.