US-China nuclear site visit talks signal rare opening for arms-control cooperation

The United States and China have begun discussing the possibility of reciprocal visits to nuclear facilities, creating a potentially significant opening for confidence-building between two countries increasingly concerned about the risk of an unconstrained nuclear arms race. The talks remain informal and preliminary, but officials have considered visits to US Department of Energy national laboratories and comparable Chinese facilities, with Washington also open to discussing access to nuclear testing sites. China initially raised the idea during meetings with American officials this year, suggesting Beijing may be willing to explore transparency measures even while resisting formal limits on its expanding nuclear arsenal.

The discussions come at a particularly sensitive moment for global nuclear security. The last remaining strategic arms-control treaty between the United States and Russia expired earlier this year, while China continues to expand both its nuclear weapons stockpile and the infrastructure supporting it. President Donald Trump has repeatedly called for a broader agreement involving Washington, Beijing and Moscow, but formal trilateral negotiations have not begun and major disagreements remain over whether China should accept restrictions while its arsenal remains much smaller than those of the United States and Russia.

Reciprocal visits would not amount to an arms-control treaty and would not automatically impose limits on warheads, missiles or testing. Their importance would instead lie in reducing uncertainty by allowing both sides to better understand selected parts of each other’s nuclear infrastructure and procedures. At a time when formal guardrails are limited, even a relatively modest transparency mechanism could help establish the trust needed for more substantive negotiations later.

China raised the idea as Washington searches for new nuclear guardrails

The proposal emerged during working-level contacts between American and Chinese officials, with much of the discussion taking place on the sidelines of meetings involving the five permanent members of the United Nations Security Council. Those gatherings bring together the United States, China, Russia, Britain and France, all recognized nuclear-armed states under the Nuclear Non-Proliferation Treaty. They provide one of the few established forums where strategic nuclear issues can be discussed even when bilateral relations are strained.

Officials have considered allowing delegations to visit US national laboratories involved in nuclear security work and equivalent institutions in China. Washington would also be willing to discuss visits involving nuclear test sites, although the precise facilities, access rules and information that might be shared have not been agreed. Any arrangement would require extensive negotiations to prevent visitors from gaining access to classified information while still making the visits meaningful enough to build confidence.

The fact that Beijing raised the idea has attracted attention because China has traditionally resisted transparency measures that it believes could reveal vulnerabilities in its smaller nuclear force. Chinese officials have long argued that the United States and Russia should make much deeper reductions before expecting China to participate in comparable arms-control restrictions. Offering reciprocal visits does not change that position, but it could indicate a willingness to discuss risk reduction separately from formal numerical limits.

China’s expanding nuclear arsenal is increasing pressure for dialogue

The United States still possesses a substantially larger nuclear arsenal than China, with roughly 5,000 total warheads compared with about 600 for Beijing. China’s stockpile, however, has grown rapidly in recent years and is expected to continue expanding as the country constructs new missile silos, modernizes submarine forces and develops additional delivery systems. That trajectory has become a central concern for US defense planners because it could eventually produce a more complex three-way nuclear balance involving Washington, Moscow and Beijing.

For decades, nuclear arms control largely focused on the United States and Soviet Union and later Russia because those countries possessed overwhelmingly larger arsenals than any other state. China maintained a relatively limited deterrent designed primarily to guarantee that it could retaliate after a nuclear attack. Its expanding force is gradually challenging that traditional structure and forcing policymakers to consider how future arms-control agreements could accommodate three major nuclear powers rather than two.

Beijing says its modernization is necessary to ensure that its deterrent can survive increasingly sophisticated American missile defenses and conventional strike capabilities. Washington sees the same expansion as evidence that China is moving toward a substantially larger and more diverse nuclear force. Reciprocal site visits would not resolve that disagreement, but they could provide additional information that reduces the risk of each country assuming the most threatening interpretation of the other’s actions.

Expiration of US-Russia arms controls has added urgency to the talks

The discussions are also occurring after the expiration of New START, the last major treaty limiting deployed strategic nuclear weapons belonging to the United States and Russia. The treaty had placed caps on deployed warheads and delivery systems while creating inspection and data-sharing mechanisms intended to give both governments confidence that the other was complying. Its disappearance has left the two largest nuclear powers without the same legally binding limits that shaped their strategic relationship for years.

That development has broader consequences for China because Washington increasingly argues that future arrangements cannot focus exclusively on Russia. American officials worry that agreeing to bilateral limits while China continues expanding without restrictions could eventually leave the United States managing two large nuclear competitors under very different rules. Beijing responds that its force remains far below US and Russian levels and that numerical comparisons therefore do not justify immediate participation in equivalent restrictions.

The result is a diplomatic stalemate in which all three governments express support for strategic stability but disagree on what negotiations should look like. A limited transparency initiative could provide a way around that obstacle by beginning with measures that do not require China to freeze or reduce its arsenal. If successful, those steps could create a foundation for more difficult discussions about warhead numbers, missile deployments and testing.

Trump wants a trilateral agreement but Beijing remains resistant to formal limits

Trump raised the possibility of trilateral arms-control negotiations during his recent meeting with Chinese President Xi Jinping. The two leaders did not discuss reciprocal nuclear site visits during that meeting, however, and Xi did not indicate that China was prepared to negotiate restrictions comparable to those previously accepted by Washington and Moscow. Chinese officials have consistently emphasized the gap between the size of the arsenals as a reason for avoiding formal numerical negotiations.

The Trump administration first pursued the idea of bringing China into nuclear arms-control talks during his first term, but those efforts produced little concrete progress. Washington has since continued arguing that China’s rapid buildup makes its participation increasingly important. The administration is expected to keep pressing the issue during further high-level meetings later this year.

Lower-level discussions on site visits could therefore serve as an important test before Trump and Xi meet again. If negotiators can establish basic procedures for transparency and reciprocal access, leaders would have a tangible confidence-building measure to discuss rather than another abstract call for negotiations. If talks stall even at that limited level, the prospects for a much broader three-country treaty would appear considerably weaker.

Nuclear inspections have historically helped countries verify rather than simply trust

On-site inspections have been a central feature of many successful arms-control and nonproliferation arrangements. Inspectors can verify equipment, confirm declared activities and compare what governments say they are doing with physical evidence. That reduces dependence on intelligence estimates alone and can make it harder for misunderstandings to escalate into strategic crises.

A US-China arrangement would likely be much more limited than traditional treaty inspections. Neither side is currently proposing unrestricted access to nuclear weapons facilities, and national laboratories perform sensitive work that governments would carefully protect. The challenge would be identifying locations and activities that reveal enough information to improve confidence without exposing military secrets.

Even carefully managed visits could still have value because the US-China nuclear relationship contains far fewer institutionalized communication mechanisms than the US-Soviet relationship eventually developed during the Cold War. Officials and experts have warned that misunderstandings surrounding military exercises, missile launches or changes in nuclear posture could become particularly dangerous during a confrontation over Taiwan or another regional crisis.

Questions over nuclear testing could become another major area of tension

The discussions also come as Washington raises concerns about possible low-yield nuclear testing by China. US officials have accused Beijing of carrying out a secret test in 2020 using techniques intended to reduce the seismic signal produced by an underground explosion. China has rejected broader accusations that it violates international nuclear testing norms.

The United States has not conducted a known explosive nuclear weapons test in decades, although American laboratories regularly conduct non-nuclear experiments designed to assess weapons performance and improve detection technology. US nuclear officials recently carried out another underground conventional explosion in Nevada as part of research intended to improve the ability to identify tests designed to evade monitoring systems.

The administration is also considering technical proposals that could help verify whether low-yield nuclear tests are taking place. If reciprocal visits eventually included testing facilities or monitoring technologies, they could become part of a broader effort to reduce disputes over whether countries are secretly violating testing norms. Establishing credible verification would nevertheless require far more detailed negotiations than the preliminary discussions currently underway.

Skepticism remains over whether China sees the proposal as more than diplomacy

American officials and nuclear-policy experts have reacted cautiously because China could have several reasons for proposing visits that fall short of genuine interest in arms control. Offering a transparency measure can create a positive diplomatic atmosphere before major summits and allow Beijing to portray itself as supportive of nuclear risk reduction without accepting restrictions on its arsenal. Washington will therefore need to determine whether the proposal develops into concrete negotiations rather than remaining a symbolic gesture.

China may have its own doubts about American intentions. Beijing could worry that US delegations would use visits primarily to collect intelligence about facilities and capabilities that China has deliberately kept opaque. Negotiators would need to establish reciprocal access rules that convince both governments they are receiving comparable benefits.

That mutual suspicion is precisely why even a limited agreement would be significant. Nuclear confidence-building measures work not because rivals suddenly trust each other, but because they create processes that make behavior more predictable despite continuing distrust. Regular communication and controlled transparency can reduce the danger that one side misreads routine activity as preparation for an attack.

Reciprocal visits could become a first step rather than a breakthrough arms treaty

The most realistic near-term outcome is therefore not a sweeping agreement that caps the American and Chinese nuclear arsenals. The discussions are better understood as an attempt to create a small but practical mechanism for strategic transparency at a time when traditional arms-control architecture is weakening. Their success would depend on whether officials can agree on which facilities are accessible, what visitors can observe and how sensitive information will be protected.

Further working-level discussions are expected before Trump and Xi are likely to meet again. Those talks could determine whether the proposal advances into a formal confidence-building arrangement or remains one of many strategic initiatives that never progress beyond preliminary diplomacy. The White House and Chinese government have not publicly committed to a specific timetable.

The stakes extend beyond the bilateral relationship because nuclear competition is increasingly becoming a three-power problem. Without new mechanisms, the United States, China and Russia could all expand or modernize their arsenals while possessing fewer constraints and verification tools than existed during earlier decades. Reciprocal US-China site visits would be modest compared with the treaties of the Cold War, but they could provide one of the few available starting points for rebuilding nuclear guardrails before another crisis forces the issue.

Key takeaways from the emerging US-China nuclear site visit discussions

• US and Chinese officials have held preliminary discussions about reciprocal visits to nuclear facilities as both countries explore limited confidence-building measures.
• China initially raised the proposal, with possible visits to US Department of Energy laboratories and comparable Chinese facilities among the ideas under consideration.
• The United States possesses roughly 5,000 total nuclear warheads compared with about 600 for China, although Beijing’s arsenal is expanding rapidly.
• China continues to resist formal limits on its nuclear buildup, arguing that its stockpile remains considerably smaller than those of the United States and Russia.
• The talks have gained urgency after the expiration of the last major US-Russia strategic arms-control treaty left fewer formal constraints on the world’s largest arsenals.
• President Donald Trump supports eventual trilateral arms-control negotiations with China and Russia, but formal three-way negotiations have not yet begun.
• Reciprocal inspections could improve transparency and reduce the risk of miscalculation without immediately requiring either country to accept numerical weapons limits.
• Further lower-level negotiations are expected before another Trump-Xi meeting, making the site-visit proposal an early test of whether broader nuclear cooperation is possible.