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Note that only states as a whole are represented, not separate territorial parts of them even if they would belong to a different group.
Please do not add unilaterally declared national or subnational zones with no international treaty, until we have a thorough survey of these.      Nuclear-weapon-free zones by international treaty, including territories that belong to a Nuclear Weapons State that has agreed the territory is subject to a zone      Nuclear weapons states and territories belonging to them that are not in any NWFZ      Nuclear sharing (US or Russian nuclear arsenal stationed there for host country use in wartime)      None of the above (but party to the Non Proliferation Treaty (NPT))