The Project for the CTBT supports the work of NGOs and experts to build public and policymaker understanding of the CTBT.

In 1996, the United States was the first nation to sign the Comprehensive Nuclear Test Ban Treaty (CTBT), which “prohibits any nuclear weapon test explosion or any other nuclear explosion.” The CTBT helps curb the spread of nuclear weapons and establishes a global monitoring network to detect and deter cheating. The time for the CTBT is now.

Project News

U.S. Questions Russian CTBT Compliance

(First published in the July/August 2019 Arms Control Today)

By Daryl G. Kimball

A top U.S. intelligence official publicly accused Russia in May of not complying with the 1996 Comprehensive Test Ban Treaty (CTBT), raising concerns that the Trump administration may be considering withdrawing from another multilateral arms control agreement. The allegation is a significant shift from recent U.S. government and intelligence community assessments.

“Russia probably is not adhering to its nuclear testing moratorium in a manner consistent with the ‘zero-yield’ standard” outlined in the CTBT, said Lt. Gen. Robert Ashley, the director of the Defense Intelligence Agency (DIA), in remarks to the Hudson Institute May 29.

Article I of the treaty requires its parties “not to carry out any nuclear weapon test explosion or any other nuclear explosion,” and the issues of low-yield, zero-yield, and subcritical tests were debated at length during the treaty’s negotiation.

Passion and Diversity at the 2019 CTBTO Science and Technology Conference

By Ilya Kursenko

The bi-annual Comprehensive Nuclear Test Ban Treaty Organization (CTBTO) Science and Technology Conference (SnT2019) took place June 24-28 at the Hofburg Palace in Vienna. The conference brought together over one thousand participants, representing the most diverse regions of the world, and gathered their ideas and perspectives at the conference grounds.

The first conference day highlighted several pertinent topics, such as: youth as the advocates of progress towards CTBT ratification, gender equality in the science and technology field, and the role of expert communities in arms control agreements. These conference discussions also corresponded to the growing global concerns focused around the future of CTBT in particular and global arms control efforts as a whole.

Recent Ratifications: Zimbabwe and Thailand

By Cole Falkner 

This past week, the Comprehensive Test Ban Treaty (CTBT) has re-emerged in the international spotlight. On Wednesday, February 13, 2019, the Republic of Zimbabwe deposited its instrument of ratification of the CTBT to the United Nations. Zimbabwe’s accession to ratification status of the treaty follows the Kingdom of Thailand’s realization of ratification on September 25, 2018. 

UN General Assembly Statements and Resolution Supporting CTBT

By Cole Falkner 

On November 26, 2018, the Seventy-Third Session of the UN General Assembly met in New York, where the “Cooperation between the United Nations and the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization [CTBTO]” resolution was adopted.