US presses China in diplomatic talks over nuclear testing and expansion
The United States is pressing China in confidential diplomatic talks over suspected low-yield nuclear testing and rapid strategic expansion across at least seven secret domestic sites. The mounting standoff has collided with an intensifying domestic debate within the US over whether to abandon its decades-long test moratorium amid concerns that China’s nuclear arsenal is projected to reach 1,500 warheads by 2035.
Diplomatic Confrontation and Secret Test Allegations
Quiet discussions on the sidelines of multilateral forums in Geneva, New York, and Casablanca have targeted alleged Chinese violations of the 1996 Comprehensive Nuclear-Test-Ban Treaty at northwest China’s Lop Nur facility. In February 2026, the US formally accused China of secretly conducting a yield-producing nuclear test in June 2020. According to official US claims made during the Conference on Disarmament shortly after the New START treaty expired, the test utilized underground “decoupling” techniques to prevent seismic detection.
Geospatial satellite intelligence has revealed extensive upgrades across Chinese installations. These span pit fabrication in Pingtong, blast testing in Zitong, fuel reprocessing in Jiuquan, Jinta, and Guangyuan, and massive laser fusion expansion in Mianyang. Much like the US National Ignition Facility at Lawrence Livermore National Laboratory, where the overwhelming majority of laser shots serve stockpile stewardship, China’s Mianyang laser complex enables advanced thermonuclear modeling without live underground detonations.
Yet while laser simulation remains permissible under existing rules, China’s parallel physical infrastructure buildup supports an active arsenal that has surpassed 600 warheads. The US is actively pursuing confidence-building verification measures, including enhanced seismic and radiological detection. US President Donald Trump has warned that the US could resume nuclear testing on an “equal basis” if these alleged breaches persist.
China continues to deny conducting explosive tests or pursuing an arms race. Beijing maintains its defensive “no first use” stance and has rebuffed formal caps by citing a massive disparity with US and Russian stockpiles.
Technical Skepticism and Detection Challenges
These escalating charges face serious technical skepticism from international analysts. In an August 2026 report for the German Institute for International and Security Affairs, Philipp Rombach notes that US claims remain unproven because of high physical detection thresholds and a persistent lack of verifiable data.
While a June 2020 seismic tremor measuring magnitude 2.75 at Lop Nur displayed waveforms consistent with hollow underground cavity decoupling, the Comprehensive Nuclear-Test-Ban Treaty Organization’s International Monitoring System is calibrated to reliably confirm blasts only above 500 to 1,000 tons of TNT equivalent. As testing physics advances, micro-yield experiments become increasingly difficult to distinguish from seismic background noise. Because the US withholds underlying sensor telemetry to shield intelligence methods, observers cannot separate ambiguous micro-yield detonations from permitted hydrodynamic experiments or industrial blasts.
Tianjiao Jiang, writing in a 2026 article for the Arms Control Association, observes that US strategists are determined to draw China into trilateral arms control alongside Russia. Jiang explains that while the US leverage-driven posture enhances conventional forward deterrence, the overarching framework remains deeply counterproductive. He argues that the approach dismisses China’s core demand to acknowledge mutual vulnerability, overlooks immense arsenal asymmetries, and pairs arms-control demands with missile-defense expansions.
Tong Zhao echoes that analytical skepticism in a Carnegie Endowment for International Peace report published this month. Zhao underscores that while US strategy correctly identifies workable operational convergence—such as reciprocal limits on theater-range strike systems in the Western Pacific and mutual inspection protocols for co-orbital space weapons—it collapses under the weight of the US’s broader doctrine.
Regional Strategic Shifts and Infrastructure Realities
Simultaneously, broader geopolitical realignments are reshaping Central Asian security and infrastructure networks. China is actively challenging Russia’s traditional grip on the regional arms market. Uzbekistan has reportedly taken delivery of four Chengdu J-10CE multi-role combat aircraft out of a total agreement for 24 fighters, signaling a major expansion of military cooperation as Russia’s defense resources remain strained by the war in Ukraine.
Economic and technical integration is proceeding in parallel across the region. Uzbek and Chinese officials are considering joint hydrocarbon extraction on the Ustyurt plateau, with Uzbek state entities requesting technical solutions from Sinopec for drilling wells up to 6,000 meters deep under high-pressure, high-temperature conditions. Uzbekistan's Uzmetkombinat and Baigong Steel have also signed a memorandum of understanding for mineral mining and steel production.
Logistical corridors are also adapting. Transport ministries from Kazakhstan and Uzbekistan have assessed transit and storage capacity at the dry megaport of Khorgos and the port of Aktau to increase freight flows through the Middle Corridor. In Almaty, Kazakhstan and China have opened a joint earthquake research center to improve seismic monitoring, featuring laboratories focused on seismic risks and early-warning technologies across the active Tian Shan region.