US offers more details on claim of China's secret nuclear test

US State Department officials have provided more details on their claim that China conducted a secret nuclear weapons test in 2020. The alleged test was described as 'a singular explosion' and was not disclosed by China. The US has confirmed it will return to nuclear testing.

Assistant Secretary of State for the Bureau of Arms Control and Nonproliferation Christopher Yeaw said on Tuesday at an event hosted by the Washington-based think tank Hudson Institute, “As the president has said, the United States will return to testing on an ‘equal basis’.” This came a day after Trump floated his idea for an “improved” three-way deal, likely involving the US, Russia, and China.

US Undersecretary of State for Arms Control and International Security Thomas DiNanno stated at a conference in Geneva that China had failed to disclose a 2020 nuclear test. Officials described the alleged test as “a singular explosion,” with connections to sites like Lop Nur mentioned in related contexts, though no further technical details were provided.

The claim raises concerns over nuclear nonproliferation. The US plans to resume nuclear testing for the first time in 33 years, following Trump's order to the military. Key terms include the New Strategic Arms Reduction Treaty, the Comprehensive Nuclear Test Ban Treaty Organization, and US-China-Russia relations.

The Chinese Embassy has not yet responded to these allegations. The event highlights tensions in arms control between the US and China.

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South Korean delegation arrives at U.S. State Department for nuclear energy negotiations, shaking hands with American diplomats amid national flags.
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Korean negotiators to visit Washington for nuclear energy talks

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Foreign Minister Cho Hyun announced on March 6 that a South Korean delegation plans to visit the United States to discuss rights for uranium enrichment and spent fuel reprocessing. This follows delays due to the Middle East war and stems from security cooperation agreed upon after last year's summit between Presidents Lee Jae Myung and Donald Trump. The talks aim to adjust the existing civil nuclear agreement.

The expiry of the New Strategic Arms Reduction Treaty (New Start) between the US and Russia could trigger a three-way arms race involving Beijing, Washington, and Moscow, analysts warn. China has reiterated its refusal to join trilateral nuclear disarmament talks with the US and Russia, citing disparities in nuclear stockpile sizes. Beijing hopes the US responds positively to Russia's suggestions to safeguard global strategic stability.

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The New START nuclear arms control treaty between the United States and Russia expired in early February 2026 without extension. President Donald Trump declined a proposed one-year renewal, criticizing the Obama-era agreement and calling for a new treaty that includes China. Secretary of State Marco Rubio emphasized the need to address China's rapid nuclear buildup in any future framework.

South Korea and the United States have agreed to pursue a stand-alone agreement on cooperation for nuclear-powered submarines. National Security Adviser Wi Sung-lac said working-level talks will begin early next year. The move follows a joint fact sheet from last month's APEC summit.

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As 2026 dawns, Japan grapples with uncertainties over the US alliance under President Trump, fearing a potential regional deal with China amid fresh lows in Beijing-Tokyo ties following PM Sanae Takaichi's Taiwan comments.

Iran and the United States held indirect talks in Oman on Friday, focusing on Tehran's nuclear program, but the negotiations returned to square one. For the first time, the US included its top military commander in the Middle East at the table. Diplomats expressed cautious optimism while emphasizing the need for a tension-free atmosphere.

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North Korea denounced on Tuesday the United States' approval of South Korea's nuclear-powered submarine push, warning it would trigger a 'nuclear domino' in the region. This marks Pyongyang's first response to the joint fact sheet released last Friday on outcomes from summits between the two allies' leaders. North Korea labeled the document as formalizing a confrontational stance and vowed countermeasures.

 

 

 

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