Costa Rica signed this UN treaty in 2017, and Seychelles followed by signing it in 2018. The agreement commits its signatories to reject and abolish a specific class of weapons of mass destruction. Which UN treaty is being described?

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Accepted Answer

Treaty on the Prohibition of Nuclear Weapons. The UN Treaty on the Prohibition of Nuclear Weapons was signed by Costa Rica in 2017 and by Seychelles in 2018.