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Pillar 1

Action 14

The Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization is to be encouraged to fully develop the verification regime for the Comprehensive Nuclear-Test-Ban Treaty, including early completion and provisional operationalization of the international monitoring system in accordance with the mandate of the Preparatory Commission, which should, upon entry into force of that Treaty, serve as an effective, reliable, participatory and non-discriminatory verification system with global reach, and provide assurance of compliance with that Treaty.

United Kingdom

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What has the NWS done so far (prior to the current Review Cycle)?

What is the NWS doing on this action in the current Review Cycle?

Sources

United States

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What has the NWS done so far (prior to the current Review Cycle)?

What is the NWS doing on this action in the current Review Cycle?

Sources

France

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What has the NWS done so far (prior to the current Review Cycle)?

France has been tasked with the deployment and operation of 16 stations of the International Monitoring System (IMS) on its territory and provides technical assistance for the operation and maintenance of eight stations abroad. It also operates a radionuclide measurement laboratory certified by the CTBTO. The last station under French responsibility, in Guadeloupe, was completed and became operational on 5 December 2019, allowing France to become the first NWS to have completed its contribution to the IMS.

What is the NWS doing on this action in the current Review Cycle?

France has published working papers supporting the International Monitoring System (IMS) and organised a side-event during the 2025 NPT Preparatory Committee, in New York, entitled "Supporting the CTBTO International Monitoring System: a unique tool for the Treaty verification regime and the scientific and civil applications"

Sources

Working Paper. Sustaining the International Monitoring System of the Comprehensive Nuclear-Test -Ban -Treaty Organization: a critical step for the credibility of compliance with the nuclear test moratorium and the services the System provides to the whole international community. NPT/CONF.2026/PC.III/WP.38 (New York), 9 May 2025. https://docs.un.org/en/NPT/CONF.2026/PC.III/WP.38

CTBTO. Activities Undertaken by Signatory and Ratifying States Under Measure (L) of the Final Declaration of the 2025 Conference on Facilitating the Entry into Force of the Treaty in the Period June 2023 – May 2025. CTBT-Art.XIV/2025/4. May 2025. https://www.ctbto.org/sites/default/files/2025-09/CTBT-Art.XIV-2025-4.pdf

Working Paper. France and the Comprehensive Nuclear-Test-Ban Treaty: an exemplary nuclear-weapon State supporting a unique tool in the disarmament and non-proliferation architecture. NPT/CONF.2026/PC.III/WP.10. 4 March 2025. https://docs.un.org/en/NPT/CONF.2026/PC.III/WP.10