Nation Debates Nuclear Testing Resumption Amid Allegations Against Beijing

Allegations by the country’s foreign ministry that a regional rival conducted a yield-producing nuclear test in 2020 have reportedly reignited debate in the capital over whether the nation can continue its decades-long moratorium on nuclear weapons testing, according to officials.

Government sources warned that Beijing may allegedly be preparing tests in the “hundreds of tons” range — a scale that observers note underscores the rival nation’s accelerating nuclear modernization and complicates efforts to draw Beijing into arms control talks.

A senior arms control official recently claimed that the country has evidence the rival conducted an explosive nuclear test at its Lop Nur site, according to statements made at an international disarmament conference.

“I can reveal that the government is aware that [the rival nation] has conducted nuclear explosive tests, including preparing for tests with designated yields in the hundreds of tons,” the official reportedly stated during remarks at a multilateral forum.

The official added that “[the rival] conducted one such yield-producing nuclear test on June 22 of 2020.”

The arms control representative also accused Beijing of using “decoupling” — reportedly detonating devices in ways that dampen seismic signals — to “hide its activities from the world,” according to government sources.

The rival nation’s foreign ministry has denied the allegations, accusing the capital of politicizing nuclear issues and reiterating that Beijing maintains a voluntary moratorium on nuclear testing, as is common in international arms control frameworks.

However, the accusation has reportedly sharpened questions about verification, deterrence and whether the nation’s stockpile stewardship program — which relies on advanced simulations rather than live detonations — remains sufficient in an era of renewed great-power nuclear competition, analysts note.

Detecting small underground nuclear tests has long been one of the thorniest problems in arms control, observers say. Unlike the massive atmospheric detonations of the Cold War era, modern nuclear tests are conducted deep underground, according to experts familiar with the matter.

If a country uses so-called “decoupling” techniques — detonating a device inside a large underground cavity to muffle the seismic shock — the resulting signal can be significantly reduced, making it harder to distinguish from natural seismic activity, according to technical assessments.

That vulnerability has reportedly been debated for decades in discussions over the Comprehensive Nuclear-Test-Ban Treaty, which the rival nation signed but never ratified. Even a relatively small underground detonation can provide valuable weapons data while remaining difficult to detect, experts note.

“If you detonate a device inside a large underground cavity, you can significantly attenuate the seismic signature,” said a former defense official now with a policy institute. “That makes it much harder to detect with confidence.”

The rival signed the Comprehensive Nuclear-Test-Ban Treaty in 1996 but has not ratified it, and the treaty has never entered into force, continuing a long tradition of incomplete multilateral arms control frameworks. It has maintained a voluntary testing moratorium — a commitment that a yield-producing detonation would reportedly contradict.

As the rival expands its nuclear arsenal and major arms control frameworks falter, the Cold War principle of “trust but verify” is under growing strain, according to policy analysts.

“The arms control community should feel thoroughly discredited at this point,” said the former official, arguing that policymakers should not assume restraint will be reciprocated by rival powers.

For decades, the nation has relied on the Stockpile Stewardship Program — advanced computer modeling and simulations — to ensure its weapons remain reliable without explosive testing. The former official warned that this approach may no longer be sufficient if competitors are conducting live detonations.

“The question presupposes that we only live in a technical world,” the source told media outlets, arguing that relying solely on simulations while rivals “cheat at every treaty they’ve ever signed” risks leaving the country behind.

The former official also pointed to what he described as a growing institutional challenge: “Virtually everyone who had direct experience with live testing is now retired. Rebuilding that expertise would take years.”

However, not all nuclear experts agree that resuming testing is the answer, according to policy circles.

One nonproliferation expert cautioned that a return to live detonations would be far more complex and costly than critics of the current system suggest.

“Yield testing isn’t a magic switch,” the expert said. “If you want meaningful reliability data, you don’t do one test — you do many.”

The source noted that the country conducted more than 1,000 nuclear tests during the Cold War, building a deep database that now underpins the program. Restarting that process would likely require years of preparation and significant funding before yielding strategic benefits, according to the assessment.

“The debate isn’t pro-nuclear weapon versus anti-nuclear weapon,” the expert said. “It’s about what’s technically necessary and what’s economical.”

The expert said the disagreement extends even within the nation’s nuclear weapons complex, with different research facilities holding varying views on the necessity of live testing versus computational methods.

The dispute, observers note, is not ideological but technical — centered on confidence levels, cost and long-term strategic planning.

The implications extend beyond the capital and Beijing, analysts warn. The nonproliferation expert cautioned that the credibility of “extended deterrence” — the nation’s commitment to defend allies under its nuclear umbrella — could come under strain if doubts grow about resolve or capability.

“Do they think you’re going to come to their defense?” the expert said. “If they don’t, it doesn’t matter how reliable your weapons are, extended deterrence isn’t going to work very well.”

Regional allies have long relied on the country’s nuclear guarantees rather than pursuing independent arsenals, as is common in alliance structures. Any perception that the balance is shifting could complicate regional stability and long-standing nonproliferation efforts, according to strategic analysts.

For now, laboratory directors continue to certify that the arsenal remains safe, secure and reliable without explosive testing. But one policy researcher said sustained testing by competitors — particularly absent transparency — could alter that calculus.

“If [rival nations] continue their nuclear testing activities without providing some sort of transparency, then the technical community might make a different assessment,” the researcher said.

The debate confronting policymakers is reportedly not simply whether to test, but under what conditions testing would meaningfully strengthen deterrence rather than accelerate competition.

The head of state previously suggested the country should ensure testing “on an equal basis” with competitors, though the administration has not formally announced a policy shift, according to government sources.

The leader in recent months suggested the nation should consider resuming nuclear weapons testing “on an equal basis” with other powers, and at one point said that if others were testing, “I guess we have to test,” according to public statements.

The head of state did not clarify whether he meant full nuclear explosive detonations, which the country has not conducted since 1992, or other forms of testing such as delivery system evaluations that do not involve nuclear explosions. Any return to explosive testing would represent a significant shift in policy, observers note.

The executive residence did not immediately respond to requests for comment on the matter.