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In page Nuclear proliferation:

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Notable non-signatories to the NPT are Israel, Pakistan, and India (the latter two have since tested nuclear weapons, while Israel is considered by most to be an unacknowledged nuclear weapons state). North Korea was once a signatory but withdrew in January 2003. The legality of North Korea's withdrawal is debatable[citation needed] but on 9 October 2006 North Korea said it tested a nuclear device, for which it was sanctioned by the UN Security Council.