Project for the CTBT

Now Online: April 2026 #ArmsControlToday Focus Read 'The NPT System Hangs in the Balance' by ACA's Executive Director @DarylGKimball and stay tuned for the release of the April issue of Arms Control Today. armscontrol.org/act/2026-04/fo…

⌛️Final call! 31 March is the last day to apply for the #CTBTO Mentoring Programme for early-career #WomenInSTEM. Join a community of mentors & peers contributing to the mission to end nuclear test explosions. Submit your application now: ctbto.info/MentoringProgr…

"Donald Trump vowed to prevent "World War III" during the 2024 campaign trail — but his actions in office could lead to the proliferation of nuclear weapons." One other possible action, resuming nuclear testing, would blow the entire NPT system apart. bloomberg.com/news/articles/…

"Top official says US still assessing how to test nuclear weapons." Two nuclear wrongs don't make a right. Instead, we must maintain the global ban on nuclear tests and reinforce monitoring and verification of the global treaty that bans such tests. reuters.com/world/top-offi…

@ArmsControlNow @UnderSecT Also @UnderSecT claims alleged Russian and Chinese n-testing creates an "intolerable" disadvantage to the U.S. Any violation of the CTBT, which Trump and Co. have dissed, is a problem. But what is the "intolerable" disadvantage? How does U.S. testing close that "gap"? It doesn't.

@DarylGKimball @UnderSecT Sen. Rosen asks @UnderSecT how other states would respond if the U.S. resumes nuclear explosive testing? Doesn't answer the question. He claims Russia and China are testing "at yield" and claims we have made no decision about what a U.S. nuclear testing program would look like.

"North Koreans who lived near nuke test site show signs of radiation exposure. Researchers caution they have not established a direct link to nuclear tests, noting other causes cannot be ruled out." Via NKNews nknews.org/2026/03/north-…

"This Infamous Radioactive 'Tomb' Is Leaking, And Experts Are Worried" sciencealert.com/this-infamous-…

During the opening of the 66th session of Working Group B, @DrRobFloyd looked ahead to the work still to come. “Even as the world faces turmoil, or perhaps because it does, we must continue to affirm, preserve and build on every achievement.”  As the #CTBT marks its 30th anniversary year, the commitment to strengthen verification and cooperation remains as important as ever.

Today, March 5 is the 56th anniversary of the entry into force of the nuclear Nonproliferation Treaty (NPT) and Intl. Day for Disarmament and Non-Proliferation Awareness. See our timeline of the history of the NPT, which we cannot take for granted: armscontrol.org/factsheets/tim…

NEWS: 'US Accuses China of Nuclear Test, Preparations' The US issued its first direct accusation of a violation of China’s obligations as a signatory to the 1996 #ComprehensiveTestBanTreaty. ACA Senior Analyst Xiaodon Liang goes into detail in #ACT. ow.ly/QITq50YpGKF

To the very large numbers of people who have been in touch from all 4 corners of the globe: Oman appreciates the support you have shown for our efforts to stop the war. Strengthened by your solidarity, Oman reaffirms its call for an immediate ceasefire and a return to responsible regional diplomacy. There are off ramps available. Let’s use them.

March 1, 2026 marked the 72nd year since the largest nuclear test conducted by the United States -- the Castle Bravo test. With US nuclear testing now on the brink of renewal, take action by telling Congress: NO funding for nuclear weapons testing. ow.ly/kXJB50YoCWP

🚨 JUST IN: So long as it doesn't ratify the Comprehensive Nuclear Test Ban Treaty, the US won't be able to seek short-notice, on-site inspections to deter and detect possible Chinese and Russian clandestine nuclear testing activities, von Hippel writes. thebulletin.org/2026/02/how-to…

Namibia to host CTBTO’s Integrated Field Exercise in 2026 ctbto.org/resources/for-…

"How to resolve the Trump administration’s allegation that China is engaged in clandestine nuclear testing" by Frank von Hippel in the Bulletin of the Atomic Scientists thebulletin.org/2026/02/how-to…

For the first time in decades, a US president is threatening to restart nuclear weapons testing. This issue is too important for our elected officials to stay silent. Message your reps to block funding for #nuclear tests using ACA's latest action alert. ow.ly/S8A550Ym4iq

"Preserving the Moratorium on Explosive Nuclear Weapons Testing," Feb. 20 Issue Brief from the @deepcutsproject by Lynn Rusten file:///Users/darylkimball/Downloads/download-2.pdf

With President Trump's announcement that the US should prepare for nuclear weapon tests nuclear explosions are back on the agenda. Our report from last year covers the policies and incentives for resuming tests of the three major nuclear states 🇷🇺 🇨🇳 🇺🇸 deepcuts.org/publications/w…

@gbrumfiel If the U.S. and eight other CTBT hold-out states would ratify the CTBT, it would provide the option for short-notice, on-site inspections to better detect and deter cheating, including harder to detect, lower-yield explosions. 7/7