Full Breakdown
CTBTO Executive Secretary Warns of Nuclear-Testing Spiral Amid Ratification Stalemate
5/1/2026, 12:34:32 AM
CTBTO Executive Secretary Warns of a Testing Spiral
On 21 April 2026, Robert Floyd, executive secretary of the Comprehensive Nuclear Test Ban Treaty Organization (CTBTO), told United Nations correspondents that a nuclear test by the United States, Russia or any other state could trigger a cascade of further tests, “a spiral that we do not want to see start, because it may never be able to be stopped.” The warning followed public threats by the United States and Russia late in 2025 to resume testing.
Background: The Comprehensive Nuclear Test Ban Treaty
The Comprehensive Nuclear Test Ban Treaty (CTBT) was adopted in 1996 and opened for signatures that same year. It requires ratification by 44 designated states to enter into force; nine have yet to ratify. The United States, China, Iran, Egypt and Israel have signed but not ratified. India, Pakistan and North Korea have neither signed nor ratified. Russia signed and ratified the treaty but revoked its ratification in 2023. Since the CTBT opened for signatures, fewer than a dozen nuclear explosions have been recorded, six of them by North Korea.
Key Actors and Their Positions
- Robert Floyd – Executive secretary, CTBTO; warns of a testing spiral and urges joint ratification by the United States, China and Russia.
- Sergei Ryabkov – Russian Deputy Foreign Minister; says Russia would resume testing only if Washington does first.
- Sergey Lavrov – Russian Foreign Minister; received Floyd’s case against unconstrained testing.
- Marco Rubio – U.S. Secretary of State; Floyd expressed willingness to meet him.
- Donald Trump – U.S. President; accused Russia and China of testing and ordered the Defense Department to begin testing “on an equal basis.”
- U.S. State Department – Publicly expressed concerns since 2019 about possible testing activities by China and Russia.
Data & Statistics
- Over 2,000 nuclear tests were conducted before the CTBT’s adoption.
- Since 1996, fewer than 12 tests have occurred, including six by North Korea.
- The CTBT requires 44 ratifications; nine designated states have not ratified.
- The treaty’s International Monitoring System can detect even relatively small nuclear explosions worldwide.
Official Statements & Responses
Floyd emphasized that the monitoring system would reveal any clandestine test, stating that any state developing a nuclear weapon would have to test and “if they did it will be known to all.” He called for a coordinated ratification effort by the United States, China and Russia, describing such a step as “certainly a powerful step forward.” Floyd also reported recent diplomatic outreach: a meeting with Lavrov in Moscow to argue that “it is not in any state’s interest to see an unconstrained return to testing,” and discussions with U.S. State Department officials, expressing openness to meet Secretary of State Marco Rubio.
Russia’s Deputy Foreign Minister Sergei Ryabkov countered that Moscow would only restart testing if Washington did so first. President Trump, meanwhile, alleged that Russia and China were already testing and directed the Defense Department to commence U.S. testing “on an equal basis.” The U.S. State Department has continued to voice concerns about possible testing activities by China and Russia.
Criticism & Opposition
Trump’s directive to resume testing reflects a direct challenge to the moratorium upheld by the CTBT framework. U.S. officials’ expressed doubts about China’s and Russia’s adherence to the testing moratorium further illustrate opposition to the treaty’s current status.
Conflicting Reports & Gaps
While both the United States and Russia have publicly threatened to resume testing, no nuclear explosions have been confirmed since the CTBT’s entry into force. The United Nations is concurrently reviewing a separate non-proliferation treaty, but details of that review remain unspecified in the sources. Additionally, the extent of any recent testing activity by China is not documented.
Verbatim Quotes
- “That is a spiral that we do not want to see start, because it may never be able to be stopped,” — Robert Floyd, Executive Secretary, CTBTO
- “ Russian Deputy Foreign Minister Sergei Ryabkov said in response that Russia would only resume nuclear tests if Washington did so first.” — Sergei Ryabkov, Russian Deputy Foreign Minister
- “that it is not in any state’s interest to see an unconstrained return to testing.” — Robert Floyd, CTBTO
- “Floyd said the treaty's international monitoring system can detect even a relatively small nuclear weapons explosion anywhere in the world.” — Robert Floyd, CTBTO
- “if they did it will be known to all,” — Robert Floyd, CTBTO
What’s Next
Floyd plans to meet Secretary of State Marco Rubio to discuss ratification pathways, while diplomatic channels remain open with Russian officials. The United Nations’ review of the separate non-proliferation treaty is slated to continue through the coming months, and the CTBTO will maintain vigilance through its monitoring network as the ratification stalemate persists.
