Good, this idea that all weapons are evil is an insane luxury belief.
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Ideally no one, and if the cost / expertise is so niche that only a handful of sophisticated actors could possibly actually do it, then in fact (by way of enforceable treaty) no one.
Anyone who wants to establish deterrence against superiors or peers, and open up options for handling weaker opponents.
> enforceable treaty
Such a thing does not exist. International affairs are and will always be in a state of anarchy. If at some point they aren't, then there is no "international" anymore.