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.

However, there are at least two major areas of concern for an effective future USSF international strategy: divisive geopolitics in space and foundational issues of a real space defense strategy beyond support services. In addition to geopolitical and strategic quandaries, organizational politics stand in the way of a sound strategy.

Divisive Geopolitics

Europe acknowledges space as congested and contested but stops short of calling space a warfighting domain. Europe adamantly refuses to declare China as a threatening adversary in the space domain. Not only does Europe struggle with a China dependency, chasing elusive economic benefits, but mainstream European diplomacy emphasizes engagement with China as a preferred way to hedge against (allegedly) unpredictable American behavior.

China managed to deter Europe from taking any offensive space posture, further making sure the North Atlantic Treaty Organization (NATO) remains busy with relentless Russian threats. It remains unclear where Europe would stand in a collective space defense scenario resulting from a multi-theater conflict involving both Taiwan and Eastern Europe.

Strategic Quandary

The USSF international partnership strategy signals a service fixated on space support rather than getting after the real problem, which is defeating space threats. This cannot be achieved without offensive space capabilities that deter, and, if necessary, destroy enemy capabilities.

In Europe and the Indo-Pacific, France and Japan are technologically capable of developing offensive capabilities, but politics forbid them from fielding offensive weapons in space, leaving Russian and Chinese rendezvous and proximity operations and kill chains unchallenged. This means such partnerships are unlikely to support the US with truly offensive capabilities in space.

Effective Bilateral and Mini-lateral Partnerships

US Space Command shares space situational awareness data with 33 partner countries, including Australia, Canada, France, Japan, Norway, and the United Kingdom (UK). Multinational Force Operation Olympic Defender (OOD) is a US Space Command operation to strengthen defenses and deter aggression in space, and involves more than six countries.

US Space Command and the US Space Force have agreements for exchange of personnel and liaison officers for these countries. Bilateral and mini-lateral partnerships include hosting payloads on allied systems such as Norway’s Arctic Satellite Broadband Mission (ASBM) and Japan’s Quasi-Zenith Satellite System (QZSS aka Michibiki); Deep Space Advanced Radar Capability (DARC) with the UK and Australia; and Joint Commercial Operations (JCO) using commercial space domain awareness data with allies and partners. Such needed bilateral and mini-lateral agreements get more done and faster.

Challenging Multilateral Partnerships

Implementing wideband global satellite communications (WGS) to provide satellite communications (SATCOM) to NATO can be challenging when over twenty nations all want to have their own homegrown terminals that can use any nation’s SATCOM satellites. This is made worse by the NATO Communications and Information Agency imposing further rules.

Bottlenecks with extremely high frequency (EHF) communications for nuclear deterrence means all capitals want to have a chance to say yay or nay on who makes the decision and communicates through the EHF with allied command operations. Compared with bi- or mini-lateral agreements, multilateral partnerships are complicated to implement.

The GAO Report on Organizational Politics

An earlier report by the Government Accountability Office (GAO) found that the US Department of Defense (DoD) faces persistent challenges that impede its efforts to integrate allies and partners into space operations and activities by establishing joint goals. The unclassified version of the GAO report tackles organizational politics specifically.
The report identified that the DoD has several organizations that have overlapping roles and responsibilities for space-related security cooperation.

Several foreign government officials said that finding the appropriate DoD contact with whom to coordinate is difficult, resulting in confusion and missed opportunities. GAO found that USSF has not identified, analyzed, or responded to the risk of not filling positions within its service components, including space-related planning, information sharing, and security cooperation positions.

The USSF strategy acknowledges resource constraints: personnel, budget, and time are limited for all parties. Overclassification limits intelligence sharing and is a concern. Policy misalignment, lack of straightforward national policies, and interoperability risks hinder cooperation.

The USSF is already seeking $6 billion for its own unfunded priorities such as its nascent Military Network (MILNET) satellite constellation and various classified projects. Meanwhile, China appears eager to beat the USSF to the punch in space refueling. Hence the criticality of the USSF astroscale refueling deal. Europe and Japan remain in the process of developing elementary space-based surveillance and passive defense assets.

Should the US Go It Alone in Space?

Current USSF half-baked strategic and cooperation models, leadership alignment issues, capability gaps among allies, and inefficiencies in multilateral agreements are not helping the US to lead in solving allies’ collective space security quandaries, let alone guaranteeing the United States’ own homeland security. In a worst-case scenario, the US might need to be prepared to go it alone and add foreign capabilities as “nice to have.”

If the US has more robust space capabilities, partnering with the US is more attractive for allies. The ability to go it alone with the prospect of winning is what gains allies, many of whom will be sitting on the fence. Furthermore, allies of the US could be knocked out, one-by-one, by China and Russia in orbit, leaving the US to go it alone anyway.

If the USSF international partnerships strategy is to be relevant, the USSF needs to further evolve from support functions to offensive space warfare, which should form the backbone of any allied international counterspace capabilities. Ultimately, in space, as on Earth, one either leads, follows, or gets out of the way. The US is allowing itself to be paralyzed by committee, which is a sure-fire way to lose the war in space that already started.

Christophe Bosquillon is a Senior Fellow at the National Institute for Deterrence Studies. He has over 30 years of international experience in general management, foreign direct investment, and private equity and fund management across various industries in Europe and the Pacific Basin. The views expressed are the author’s own.

Should the US Go It Alone in Space? was originally published on Global Security Review.

Buff asserts that the US must invest heavily in full-spectrum military capabilities to deter adversaries. However, history shows that militarization alone often escalates tensions rather than resolving them. For instance, the Cuban Missile Crisis—a frequent example in escalation dominance arguments—was resolved through diplomacy, not military action.

President John F. Kennedy and Soviet General Secretary Nikita Khrushchev’s willingness to negotiate behind the scenes prevented catastrophe. This underscores the need for diplomacy as a primary tool of deterrence, rather than relying solely on military might.

The concept of escalation dominance inherently invites an arms race. If the Americans aim for superiority at every “rung” of the escalation ladder, adversaries will predictably respond by developing their own capabilities, leading to a dangerous spiral of militarization.

This is evident in the ongoing nuclear arms race with Russia and China, where both nations responded to American advancements with their own. Far from ensuring security, this creates an unstable environment where miscalculation or miscommunication can lead to catastrophic conflict.

Buff’s advocacy for relentless dominance neglects the immense human and ethical costs of prolonged conflict. The destruction in Ukraine serves as a stark warning of the devastation that unchecked militarization can bring. Escalation dominance does not account for the millions of civilians who suffer in war zones, the refugees who flee their homes, or the global economic and environmental impacts of sustained conflict. A more humane approach prioritizes conflict prevention through diplomacy, humanitarian aid, and economic development.

The article frames restraint as synonymous with appeasement, a reductive argument that misrepresents modern security strategies. Restraint does not mean inaction—it means carefully measured responses that avoid unnecessary escalation while maintaining credibility.

The assumption that adversaries only understand brute force disregards the nuanced motivations behind their actions. Engaging adversaries through dialogue and understanding, rather than confrontation, is often a more effective way to address their concerns and reduce hostilities.

The push for escalation dominance ignores the domestic consequences of prioritizing military spending over critical needs like healthcare, education, and infrastructure. Buff argues that America’s survival depends on overwhelming military capability, yet the true strength of a nation lies in the well-being of its people. Allocating resources to address systemic inequalities and bolster resilience at home is a more sustainable approach to national security than pouring trillions into the Pentagon.

Rather than focusing solely on military dominance, the US should adopt a balanced approach to deterrence. It should incorporate four major objectives.

First, diplomacy should always be the first option. Prioritizing dialogue and international cooperation to resolve conflicts must always precede conflict and escalation.

Second, arms control is a necessary component of national strategy. Reinvigorating arms control agreements to reduce the risk of catastrophic war and rebuilding trust with adversaries is a must.

Third, humanitarian engagement is core to American foreign policy. Addressing root causes of instability, such as poverty, inequality, and climate change, through global partnerships, can prevent conflict.

Fourth, smart defense spending is critical to an affordable defense. Invest in modern, cost-effective defense strategies while reallocating excess military funds to domestic needs is important for the nation.

Buff’s call for escalation dominance reflects a worldview that prioritizes power over pragmatism and ignores the interconnected realities of the 21st century. True security comes not from the constant threat of overwhelming force, but from fostering global stability through cooperation, understanding, and sustainable policies. The US must resist the temptation to revert to Cold War thinking and instead embrace strategies that build a more peaceful and equitable world.

Katerina Canyon is the Executive Director of the Peace Economy Project. The views expressed are her own.

Escalation Dominance Is a Flawed Framework was originally published on Global Security Review.