VIENNA: At their inaugural meeting in Vienna, States Parties to the Treaty on the Prohibition of Nuclear Weapons (TPNW) began studying the treaty's implementation, reviewing its status, and assessing signatories' progress toward its goals. In a video greeting to attendees on Tuesday, UN Secretary-General Antonio Guterres said the TPNW is "a vital step towards the common vision of a world without nuclear weapons." He said the meeting's conclusions would "help solidify the Treaty's status as an essential element of the global disarmament and non-proliferation framework." According to reports, the TPNW has a comprehensive set of restrictions on participation in any nuclear weapon activity and requires signatories not to develop, test, produce, acquire, possess, stockpile, use, or threaten to use nuclear weapons. The treaty was adopted by the United Nations in July 2017 and will go into effect in January 2021. According to the United Nations Information Service in Vienna, 65 states have ratified or acceded to the deal, while 86 have signed it. Iran removing 27 surveillance cameras from its nuclear facilities: IAEA N.Korea sets for party meet amid reports of possible nuclear test S.Korea, US, Japan hold high-level talks on global issues