US State Department Alleges China Conducted Clandestine Nuclear Tests Reigniting National Defense Debate

Washington officials clash over nuclear policy as the State Department accuses China of clandestine testing at Lop Nur following the New START treaty expiration.

By: AXL Media

Published: Feb 17, 2026, 11:34 AM EST

Source: Information for this report was sourced from Fox News

The Geneva Disclosure and Technical Allegations

The United States government has publicly accused China of conducting secret underground nuclear weapons tests, raising significant concerns regarding global security and military stability. During a recent address at the United Nations Conference on Disarmament in Geneva, Under Secretary of State for Arms Control and International Security Thomas DiNanno revealed intelligence suggesting that Beijing has performed yield producing explosive tests. The allegations specifically point to an event on June 22 of 2020 at the Lop Nur test site in Xinjiang, where officials believe a nuclear device was detonated despite international agreements.

State Department officials emphasized that China utilized a technique known as decoupling to hide these activities from the world. Decoupling involves detonating a nuclear device in a large underground cavern to muffle the seismic signals that typically alert international monitors to an explosion. This method allows a country to conduct tests with yields in the hundreds of tons while appearing to remain within the limits of a voluntary moratorium. The disclosure represents a shift toward a more confrontational stance by Washington as it seeks to address the rapid modernization of China's nuclear triad.

Historical Moratoriums and the New START Expiration

This high level accusation arrives at a critical juncture for international arms control. The New START treaty, which was the last remaining bilateral nuclear agreement between the United States and Russia, expired in February 2026. With the expiration of these regulatory guardrails, the global nuclear order has entered a period of heightened uncertainty. President Donald Trump has resisted an informal extension of previous limits, calling instead for a new and modernized framework that must include China as a full participant.

The United States has maintained a unilateral moratorium on full scale nuclear explosive testing since 1992, relying instead on advanced supercomputer simulations to ensure the reliability of its stockpile. However, the recent allegations against Beijing have reignited a fierce debate in Washington about the effectiveness of this policy. Proponents of a return to testing argue that the actions of rivals have made the current moratorium a strategic liability. They suggest that American forces must demo...