Okay. Russia drone go boom in Ukraine. Ukraine have no drone. How get drone.
1991-1994: They nuke Moscow.
1994-present day: American strategic deterrence takes over.
If any part of that is unclear to you then I urge that you reread the Budapest Memorandum on Security Assurances and return to the discussion with the rest of the context.
Anduril does not manufacture strategic deterrents. If you think they're the solution to the Budapest Memorandum then you're the sort of armchair YouTube General that the Army filters out in officer school. It's not hard to understand, anyone can Google the difference between strategy and tactics.
Edit: oh I see, you only support strategic deterrence which equates to “standby until we have to nuke them.”
Ukraine had physical possession of the nukes, but their ability to actually use them was highly suspect. They might have been able to circumvent the security measures given enough time, but if anything such an attempt would have sparked an international "peacekeeping operation" to make sure the nukes didn't fall into the wrong hands.
https://cisac.fsi.stanford.edu/news/budapest-memorandum-myth...
If Ukraine had the physics package, why couldn't they deploy it? Barring launch codes from the Kremlin, there's still enriched uranium in the warhead that you can turn into a simpler one-stage bomb. I doubt they could have gone thermonuclear, but simply leveraging the ICBMs and fissile material seems well within Ukraine's wheelhouse.