What Is the Third Nuclear Age?

The world can be divided into three eras of nuclear weapons history, each defined by distinct weapons dynamics and geopolitical relationships, and distinguished by major proliferation or treaty events of its time.

The first nuclear era was characterized by a bipolar rivalry between the United States and the Soviet Union during the Cold War, from 1945 to the late 1980s. At its peak, the number of warheads held by both countries is estimated to have reached around 60,000 in 1986. This era was marked by limited arms control agreements and significant arms racing.

The second nuclear era, spanning from 1991 to 2013, saw significant disarmament through bilateral U.S.–Russia treaties such as START I and New START, which reduced global warhead numbers by a considerable amount. However, this period was also marked by nuclear proliferation efforts by regional actors, including the nuclearization of South Asia, particularly India, followed by Pakistan, and then North Korea’s decision to pursue nuclear weapons.

Beginning in 2014, the third nuclear era emerged, typified by the current, chaotic, multipolar environment. Russia has unilaterally suspended participation in New START monitoring and verification, a treaty that expired on February 5^th, 2026. Both the United Kingdom and France have commenced modernization and expansion of their nuclear forces. China is rapidly nearing an estimated 600 warheads, North Korea continues to test intercontinental ballistic missiles (ICBMs), and Russia has modernized its weapons systems and deployed short-range nuclear weapons in Belarus. Iran continues to signal that it is nearing the nuclear threshold, opacity persists regarding Israel’s nuclear capabilities, and the May 2025 conflict between India and Pakistan has created multiple additional flashpoints, all of which underscore the need for new international multilateral guardrails.

Current Global Nuclear Trends

The United States has initiated a $1.7 trillion nuclear triad modernization plan, which includes submarines, bombers, and land-based missiles. Russia has been testing nuclear-powered cruise missiles such as Burevestnik, while China is expanding its nuclear weapons capability at a rapid pace amid rising tensions over Taiwan.

In addition, strategic non-nuclear weapons, including hypersonic systems, AI-driven command structures, and missile defense, are contributing to an escalatory environment in which the nuclear ladder has become increasingly slippery to climb and equally difficult to descend. The Bulletin of the Atomic Scientists has set its “Doomsday Clock” at 89 seconds to midnight, the closest it has ever been since 1947, reflecting its assessment that the erosion of arms control, the expansion of nuclear capabilities, and the persistence of conflict have significantly increased the risk of nuclear catastrophe.

Escalating Global Nuclear Challenges

The U.S.-Russia arms control negotiations have ceased over Ukraine, and President Putin has reduced stated nuclear use thresholds. At the same time, U.S. military strikes against Iran have alarmed some observers who argue that such actions undermine norms governing sovereignty. NATO countries are increasingly exploring their own European deterrence capabilities.

A defining feature of the third nuclear age is the growing complexity of the strategic environment and the inability to manage global risks through simple bilateral frameworks.

Technological advancements that accelerate escalation risks include hypersonic weapons that challenge missile defense systems, artificial intelligence that may misinterpret launch indicators, and cyber operations that could inadvertently contribute to nuclear escalation—echoing historical false-alarm incidents in 1983. Meanwhile, China’s evolving relationship with Russia further complicates U.S. efforts to deter aggression across both Europe and the Asia-Pacific.

The Way Forward

With New START having expired, significant future limits on the number of nuclear weapons possessed by major powers appear unlikely, accelerating competition and instability. By the mid-2030s, the convergence of nuclear and advanced conventional capabilities may become normalized as tools of coercion rather than deterrence, while additional states may seek nuclear weapons should nonproliferation barriers erode. The Bulletin of the Atomic Scientists has identified the emergence of the “third nuclear age” as the top global risk in 2026.

Accordingly, new mechanisms for arms control and nuclear disarmament consistent with commitments made by major nuclear-weapon states under the NPT framework are urgently required. These include enhanced verification technologies, AI-assisted monitoring, restraints on the development of destabilizing new weapons, and sustained strategic-stability dialogue aimed at separating and disentangling nuclear and conventional escalation pathways. Additional measures to promote norms of responsible nuclear behavior are also necessary, although opposition from the five permanent members of the UN Security Council remains a significant barrier to progress. Ensuring the global security of radioactive materials must remain a priority.

The third nuclear age has placed humanity in unprecedented danger. Existing disarmament mechanisms have proven ineffective as new rivalries emerge, and technological changes accelerate. History demonstrates that diplomacy can work: New START reduced nuclear arsenals to their lowest levels since the early years of the first nuclear era. Today’s leaders must again prioritize cooperation and restraint, or risk allowing miscalculation to turn expanding arsenals into catastrophe. The alternative is too terrible to ignore.

Ms. Harsa Kakar is an Assistant Research Fellow at the Balochistan Think Tank Network (BTTN), Quetta. Views expressed in this article are the author’s own. 

Understanding the Third Nuclear Age: Why 2026 Matters was originally published on Global Security Review.

China became the first nuclear state to sign this treaty’s protocols because the treaty aligns with its national security strategy and active-defense doctrine, which includes the unconditional no first use of nuclear weapons against non-nuclear-weapon states. Russia also expressed a willingness to sign. The US is evaluating its approach, boosting the chances of it being ratified worldwide.

While maintaining political neutrality can assist in lowering the risk of nuclear brinkmanship, SEANWFZ relies on ASEAN’s ability to manage great power competition. SEANWFZ is intended to provide “the regional pathway” to the ultimate objective of a world free of nuclear weapons.

Despite the treaty’s normative strength, four recognized nuclear weapon states (NWS), under the Nuclear Non-proliferation Treaty (NPT), France, Russia, the United Kingdom, and the US, do not provide assurances, or “protocol signatures,” which are essential for the effectiveness of SEANWFZ. By joining the protocol, the nuclear weapons states would be required to uphold the treaty, abstain from actions that would violate it, and offer negative security assurances (NSA), such as the promise not to use or threaten to use nuclear weapons against the SEANWFZ states or within the zone.

The strategic interests of the major powers historically cross in Southeast Asia. Many regional states continue to have tight security relations or security alliances with outside countries. This is the fundamental cause of the NWS’s failure to sign its protocol. Beijing, which stands apart from other hesitant nuclear weapons states, frequently cites strategic ambiguity and alliance duties and has repeatedly stated that it is willing to sign the agreement. Its recent remarks confirm this commitment.

While strengthening long-standing cooperation with ASEAN, China’s decision to sign the nuclear-free zone established a norm regarding big powers assisting in the regional disarmament framework. By supporting SEANWFZ, China contributes significantly to a regional standard that deters the use, threat, or deployment of nuclear weapons. Along with that, China is also supporting larger international nonproliferation objectives, which is especially important considering global nuclear modernization tendencies and growing geopolitical tensions.

It is also noteworthy that this move by China comes at a time when the world is increasingly inclined toward acquiring military platforms and modernizing its already possessed weapons. China’s decision to sign a nuclear-weapon-free zone is also important for the credibility of international law and regimes governing disarmament. It will strengthen their provisions and set a precedent for other regional and global powers to follow China’s footsteps for global stability and security.

Strategically, China’s adoption of SEANWFZ can help counter the perceptions of rising assertiveness in the South China Sea by presenting itself as a responsible nuclear power committed to regional stability and nonproliferation. Diplomatically, China’s relationships with ASEAN strengthened and deepened, with its broader goal of a multipolar world where regional agreements carry more influence.

Notably, it also differs from the American position in Asia, where Washington’s long-standing nuclear deterrence approach frequently makes backing for nuclear-weapon-free zones difficult. China’s strong support for ASEAN’s nuclear-weapon-free zones boosts the global nonproliferation drive despite continuous disruptions to major treaties, such as the collapse of the Intermediate Nuclear Forces Treaty (INF) and the precarious situation of New START (Strategic Arms Reduction Agreement). Furthermore, in a zone that has so far rejected the lure of nuclear weapons, it strengthens the moral case for nuclear abstention.

China’s willingness to sign the SEANWFZ is a tool for norm-setting and cooperative security. The US and other nuclear-armed nations must follow suit for the treaty to be successful. ASEAN won diplomatically with China’s SEANWFZ commitment, but it needs other nuclear weapons states’ support. ASEAN’s efforts act as a small but significant barrier against the proliferation of nuclear weapons with China’s backing, reminding that regional actions can still be crucial in determining the parameters of the global nuclear order as strategic uncertainties across the world increase.

Nazia Sheikh is a Research Officer at the Centre for International Strategic Studies, AJK.

China’s Support for the Southeast Asia Nuclear-Weapon-Free Zone was originally published on Global Security Review.

As great powers become entangled in trade disputes, the spillover effects threaten to undermine the cooperative spirit essential for effective arms control. These economic conflicts erode bilateral relationships, making it even more challenging to negotiate future agreements on critical and emerging domains such as artificial intelligence, cyber warfare, and the militarization of outer space.

Tariffs can disrupt trade, increase prices, stifle innovation, and agitate the supply chain. Moreover, it can weaken American global leadership as long-term allies face an American president unwilling to accept high tariffs on American exports while guaranteeing low tariffs on imports. American efforts to counter China are disrupted by tariff disputes as well, as allies and foes coordinate their strategies for countering President Trump’s effort to reduce tariffs on American exports. The president’s actions erode the confidence of allies in extended nuclear deterrence because allies begin to question whether the United States will continue to subsidize security, if they are demanding an end to protective tariffs.

The tariff dispute between China and the US, two large trading partners, severely affects arms control and strategic stability. It exacerbates crisis, heightens mistrust, undermines confidence-building measures, and curtails the possibility of a constructive arms control framework. It is, however, not unexpected. The United States long tolerated protective tariffs and poor intellectual property protections by the Chinese. Thus, rebalancing should not come as any surprise, even if it is disconcerting.

American technological superiority, innovation, cutting-edge military and civilian technology, and significant soft-power influence are the key components of its hegemonic status. Central to this dominance is access to rare earth minerals, which are critical for producing advanced weaponry, including missiles, drones, artificial intelligence (AI)–driven systems, and cutting-edge civilian technologies. However, the US faces a growing vulnerability in this domain, as China currently controls approximately 70 percent of the global supply of rare earth elements. This strategic dependency seriously challenges American innovation and military effectiveness.

However, the American military is already in decline according to a report from the US Army Science Board, which reveals the limitations of the American industrial base. The report warned that the US may be “incapable of meeting the munitions demand created by a potential future fight against a peer adversary.”

The conflict in Ukraine underscores this concern, as the US struggles to maintain adequate production levels of artillery shells, drones, rockets, and missiles primarily due to insufficient stockpiles of critical components. Furthermore, structural deficiencies are increasingly evident within the US Navy. As of 2023, less than 68 percent of surface fleet ships were rated “mission-capable,” with only 63 percent of attack submarines meeting the same standard. Compounding these challenges, American shipyards are currently unable to produce more than three destroyers annually. By contrast, China possesses 13 shipyards capable of constructing large and deep-draft vessels one of which reportedly surpasses the entire US shipbuilding capacity.

The ongoing US-China tariff dispute reflects a zero-sum strategic mindset, intensifying hostilities and reducing incentives for restraint or cooperation. This economic confrontation has already narrowed the space for meaningful arms control dialogue. The imposition of sanctions on each other’s officials and entities alongside increasingly provocative rhetoric from senior officials risks further erosions of the fragile trust necessary for future diplomatic engagement, particularly in arms control and emerging domains such as AI, cyber warfare, and outer space.

Traditionally, China rejects arms control as the US had far more weapons than China. Tarriff disputes reinforce the narrative that the US is using economic means to contain China’s rise, making China less likely to engage in future arms control discussions. Moreover, diplomatic relations and multilateralism will weaken and increase mistrust—leaving no room for constructive future arms control talks.

Arms control forums are increasingly fragile as mutual trust and respect for arms control and disarmament among the great powers declines. Tariff disputes create mistrust, which complicates the verification process, and the supply chain supporting the global cooperative arms control verification limits the ability to enforce or verify compliance with arms control agreements.

Trade disputes deepen mistrust and normalize confrontation over cooperation, secrecy over transparency, and arms racing over arms control. This leads to proliferation while making accountability less relative and paves the way for a fragmented world order with little or no hope for future arms control.

Moreover, it increases the chances future administrations face a backlash for rolling back policies that demand equitable treatment of American trade goods, fearing internal backlash for being soft on China. This will permanently lock both states into an adversarial stance, reducing any flexibility in arms control. Moreover, if the US wants to reconsider any future arms control discussion, political costs may prove too high, leaving fewer options to prevent an arms race.

In 2019, President Donald Trump withdrew the United States from the Intermediate-Range Nuclear Forces (INF) Treaty, after Russian cheating became too hard to ignore.  Meanwhile, the future of New START remains uncertain and fragile.

At such a critical juncture, President Trump’s demand that American exports sent to foreign markets receive equal treatment to those foreign imports entering the United States, penalizing both allies and adversaries who enact punitive tariffs, may be unsettling for recipients of increased tariffs, but it should come as no surprise that an American president elected to stop the outflow of American wealth would seek equal treatment for American exports.

Many Americans are willing to see the subsidies to foreign nations—that are brought about by high tariffs on American exports and American extended deterrence—come to an end. This may lead to an erosion of confidence in American benevolence by some states.

South Korea, for example, was shocked that the United States took offense to the very protectionist policies that allowed South Korea to become the third largest auto producer in the United States, all while effectively preventing American automobile sales in South Korea. Thus, South Korea is reconsidering their non-nuclear status and exploring an independent nuclear deterrent. As President Trump seeks to level the playing field by forcing down the tariffs of trade partners, under the threat of higher tariffs on imported goods, allies should come to understand that the United States is increasingly unwilling to subsidize others. While this may be a jarring fact, it is not a purposeful effort to destabilize arms control.

Thus, trade disputes may cause allies and adversaries to reconsider American willingness to accept unequal trade and disproportionate burden sharing. In the long run, equilibrium will return. It is just a matter of what that equilibrium may look like.

Muhammad Shahzad Akram is a Research Officer at the Center for International Strategic Studies, Azad Jammu Kashmir. He holds an MPhil in International Relations from Quaid-i-Azam University, Islamabad. He is an alumnus of the Near East South Asia (NESA) Center for Strategic Studies, National Defense University (NDU), Washington, DC. His expertise includes cyber warfare and strategy, arms control, and disarmament.

How Trade Disputes Threaten the Future of Arms Control was originally published on Global Security Review.

ICBM EAR – Week of February 24, 2025

Deterrence at a Crossroads: A Call for Strength and Resolve

America is pivotal in nuclear modernization, strategic deterrence, and global security. As threats from Russia and China escalate, U.S. defense policy must adapt—or risk catastrophic consequences.

Key Strategic Insights

Nuclear Deterrence Imperative – The Minuteman III test launch underscores the critical need for modernization. General Tom Bussiere warns: “We must recapitalize our nuclear forces while maintaining the old—an unprecedented challenge.”

The Russian Threat – Moscow’s aggression is reinforced by information warfare and nuclear coercion. Sergei Shoigu states: “We must undermine the political, economic, and social system of the West.” The impending New START Treaty expiration (2026) raises concerns of a Russian nuclear breakout.

China’s Strategic Decline – $168 billion in foreign direct investment fled China in 2024. Its aggressive military expansion—the largest since WWII—coupled with its alliance with Russia, isolates Beijing internationally.

Global Realignment & Defense Priorities –
Britain increases defense spending (2.5% GDP by 2027).
South Korea considers nuclear options in response to North Korea.
The U.S. must act decisively to maintain strategic dominance.

The Cost of Hesitation

From Ukraine’s nuclear disarmament to past Western miscalculations on Russia, history warns against underestimating adversaries. De-escalation as a default strategy has failed.

The Air Force Association calls for a $45 billion annual increase in USAF and Space Force funding. As Stephen Feinberg, Deputy Secretary of Defense nominee, bluntly states:

“If we do not plug our capability gaps, we will lose to China.”

Call to Action: Strength Through Deterrence

Fully modernize the U.S. nuclear triad
Accelerate next-generation air and missile defense
Fund a credible and flexible deterrent

Deterrence is not optional—it is the foundation of peace. America must lead with strength, invest in security, and ensure our adversaries understand that aggression will never be left unanswered.

The future is watching. We must be ready.

ICBM EAR Week of Feb 24th was originally published on Global Security Review.

Arms control and disarmament advocates differ with this view, seeing the deterrent as a risk that must be reduced in size and function via various forms of diplomacy that range from one-party declarations and codes of conduct to formal arms control agreements. These sorts of undertakings are currently moribund within officialdom, though enjoying an eternal spring of hope among the single-issue think tanks, academics, and commentators who strive to sway government.

Paradoxically the current surge in hostilities between the United States and the axis of autocracy (China, North Korea, and Russia) could furnish the spark that revives official efforts at both improving deterrence and renewed arms control. For instance, an updated Budapest Memorandum might form one component of a settlement or freezing of the Russian invasion of Ukraine. An Iranian “regime change” may also offer a path for a true and verifiable non-nuclear-weapon Iran.

The modality of any future arms control arrangement could vary greatly. Not all arms control arrangements are treaties. Given the current international situation among nuclear-armed states, treaties might indeed be the least likely of modalities. Some modalities that future arms control arrangements could take include unilateral American declarations, American-backed codes of conduct, American-backed norms, agreement within NATO (such as the Committee on Proliferation or the Nuclear Planning Group), unilateral American renewal of earlier Negative Security Assurances (such as those deposited with the United Nations), bilateral or multilateral statements, bilateral or multilateral memorandum or other agreed instrument short of a treaty, and/or bilateral or multilateral treaties.

The Process of Arms Control

All these arms control approaches present challenges to American and NATO forces. They also present opportunities to refine force posture and employment options. Three concrete steps are useful in ensuring American and alliance leadership receives constant feedback with operational decision-makers.

First, it is important to sustain collaboration. As government and American allies contemplate arms control arrangements, nuclear-force commanders should offer information on the challenges and opportunities that various permutations of an arrangement present to force posture and operations. Not all ideas are operationally possible.

Second, highlight the challenges that an arrangement poses to fielded forces. As part of any discussions, commanders should relate how they would adjust operations as nascent arrangements move toward implementation. This would likely be a stepwise evolution of operations in reaction to implementation of disclosures and intrusion that could accompany various forms of arms control measures. Policymakers rarely understand what their aspirational objectives mean for operational forces.

Third, highlight opportunities an arrangement creates for forces. Similarly, commanders should monitor the evolution of arms control arrangements and be on the lookout for arrangements that permit gleaning information about adversary forces—information that is useful in crafting the best force posture, plans, and operational tactics.

These feedback loops would evolve in phases over the time that an arms control arrangement is contemplated, refined, and implemented (or rejected).

The Phases of Arms Control

Any future arms control agreement should have six phases:

Phase 1 takes place during internal American contemplation of potential arms control arrangements. Classified analysis of changes to operations that an arrangement might necessitate are discussed. When inspections are proposed, any detrimental effects to operations from various forms of inspection are discussed. Discussing the benefits of inspecting adversary installations is also an important consideration. 

Phase 2 occurs during outreach with adversaries and third-country parties. Internal “food-for-thought” papers from the operational community are prepared for negotiators and strategic-communications personnel. Deliberate public statements such as editorials and conference presentations serve a useful purpose in explaining American interests.  

Phase 3 takes place during formalization of an arms control arrangement. When requested by the Department of Defense, Department of State, National Security Council, the president, or other officials, public statements are made for adversary consumption. 

Phase 4 is the implementation phase. This is the period in which an arms control arrangement comes into effect by treaty agreement or as a unilateral/bilateral/multilateral action. Classified reports on implementation progress of the new arrangement are prepared. When inspections are part of the arrangement, coordination between government agencies occurs.

Phase 5 is focused on sustainment. During this period an arms control arrangement is in effect. Classified reports address difficulties from the arrangement. 

Phase 6 is the sunset period. This is when the arms control arrangement ends or appears to be faltering. Analysis of the operational steps, timeline, costs, equipment, and personnel necessary to terminate the arms control arrangement is conducted. Classified reports on progress toward ceasing any earlier changes to operations and capabilities, necessitated by the arrangement, are conducted.

Conclusion

Arms control for the sake of arms control was always a bad idea. The United States is no longer in a position where it can enter into arms control agreements because it furthers an idealist ambition to promote peace. Today, arms control is only useful if it furthers American interests.

Taking a hard-nosed look at arms control in its various forms is necessary, but it must be acceptable for the answer to be no. The United States is no longer in a position to act altruistically. Russia is a superior nuclear power, and China may reach a similar status within a decade. The world has changed and American leaders must accept that its adversaries are no longer willing to follow America’s lead.

Professor Stephen Cimbala, PhD, is a professor at Penn State-Brandywine. Views expressed are his own.

An Uncertain Future for Arms Control was originally published on Global Security Review.