Tests, accidental detonations, and peaceful nuclear explosions are not included. During 2025, UTC time.
The weapon must detonate to be included.
2024 version: Which countries will detonate a nuclear weapon offensively in 2024?
How is this list exhaustive?
<edit> I'm dumb, did not see the "other countries" option
The intent here is that this list is exhaustive; if there is an offensive nuclear detonation, at least one of the categories can resolve positively. That is: "country" and "non-state actor" include all possible actors; between that and "unattributed", something can resolve positively.
Did I miss anything there? Any edge cases worth worrying about?
Extraterrestrial Aliens.
OK, yep, that's an edge case I missed. Hopefully not worth worrying about, though. I think that could result in a situation where an alien state offensively detonates a nuke and nothing here resolves in response.