By Brahma Chellaney, The Hill

One of the least-discussed but most consequential outcomes of the resurgence of major-power rivalries is the return of nuclear weapons to the center of international politics.
The global salience of nuclear weapons — once expected to diminish after the Cold War — is instead rising sharply. This revival is testing U.S. power at a moment when Washington faces a more complex and fragmented strategic landscape than at any time since the dawn of the nuclear age.
The problem is not just that nuclear arsenals are expanding. It is also that the geopolitical environment that once helped manage nuclear risks has eroded.
Advances in non-nuclear strategic technologies — including precision-guided conventional strike systems, cyberwarfare, anti-satellite weapons and layered missile defenses — are driving nuclear-armed states to harden, diversify and enlarge their arsenals to ensure survivable second-strike capabilities. At the same time, regional flashpoints — from Ukraine to the Taiwan Strait to the Korean Peninsula — heighten the risk of escalation through miscalculation or coercion.
No shift is more momentous than China’s sweeping peacetime military expansion — the most ambitious in modern history. Its naval output alone now surpasses the combined production of U.S. and Soviet shipyards at the height of the Cold War. Even more troubling is its frenzied nuclear buildup: China has more than doubled its nuclear-weapons stockpile in just five years and is on track to field as many deployed warheads as the U.S. by the mid-2030s.
Determined to supplant the U.S. as the world’s leading power, China is not only expanding but diversifying its nuclear arsenal. The aim is to give Beijing an expanded set of coercive tools and create new escalation pathways. In effect, China has already diluted its own longstanding “no first use” nuclear pledge. Few now view that declaratory policy as credible.
Although China’s nuclear surge is framed domestically as defensive, its purpose extends beyond deterrence. Beijing’s growing arsenal enables it to pursue coercive territorial and strategic objectives — from the South and East China Seas to the Himalayas. The implications for U.S. extended deterrence, especially in the Indo-Pacific, are profound.
Russia, meanwhile, has turned to nuclear weapons as the principal currency of its great-power status amid economic stagnation.
Its modernization program includes novel, destabilizing systems such as the nuclear-powered Burevestnik cruise missile and Poseidon underwater drone. These exotic weapons are explicitly designed to circumvent U.S. missile defenses. The Ukraine war has visibly increased the importance — and the coercive utility — of nuclear weapons in Russian strategy.
The combined nuclear expansions of China and Russia pose a challenge the U.S. has never confronted before: deterring two peer or near-peer nuclear adversaries simultaneously. During the Cold War, Washington could focus its strategic posture on a single rival, the Soviet Union. Today, the geometry is tripolar, and far more complex.
To make matters worse, the arms-control framework that provided essential guardrails for decades has nearly collapsed. Russia and the U.S. have withdrawn from key agreements, with Moscow recently suspending its participation in the New START Treaty and also withdrawing its ratification of the Comprehensive Test Ban Treaty. China, for its part, refuses to enter any arms-control negotiation that might cap its rapidly rising arsenal.
The result is a world sliding toward an unconstrained arms race, with fewer safety valves and greater risks of miscalculation.
This shifting balance reverberates through America’s alliance system. Allies who depend on the U.S. nuclear umbrella — particularly Japan, South Korea, Australia and NATO’s eastern members — are increasingly anxious about whether Washington would risk a nuclear exchange with China or Russia to defend them. Their concern is not theoretical: The simultaneous growth of Chinese and Russian nuclear prowess creates the very scenario U.S. strategists long feared — deterrence stress in multiple theaters.
As credibility questions grow, so does the risk of allied nuclear proliferation. If countries with advanced nuclear fuel cycles come to doubt long-term U.S. protection, they may seek independent deterrents. The Nuclear Non-Proliferation Treaty is already strained by the modernization programs of nuclear-weapon states. Moreover, the U.S. bombing of Iranian nuclear sites earlier this year — while successful tactically — may deepen incentives for clandestine nuclear development elsewhere.
The U.S. now faces a stark reality: It must modernize its nuclear forces, reassure anxious allies, deter two nuclear peers and revive some form of strategic dialogue — all while preventing a ruinous arms race.
America’s challenge is to maintain credible deterrence across two theaters without overextending U.S. conventional forces. That pressure may tempt Washington to rely more heavily on nuclear weapons to compensate for shrinking force-projection margins vis-à-vis China in the Indo-Pacific and Russia in Europe. Such a shift would mirror the very trends that have made nuclear weapons so prominent in Russian and Chinese strategies.
In this volatile environment, risk-reduction mechanisms are essential. The world needs updated norms for emerging technologies — particularly artificial intelligence, hypersonic delivery systems and dual-use cyber capabilities — that could compress decision time or introduce new uncertainties in nuclear command and control.
Ensuring that nuclear-use authority remains fully under human control is no longer simply a normative concern; it is becoming a strategic imperative in the age of AI.
Brahma Chellaney is a geostrategist and the author of nine books, including the award-winning “Water: Asia’s New Battleground.”





A moment of silence is observed at 11:02 am on Aug. 9 at the Peace Statue in Nagasaki, marking the moment an atomic bomb was dropped on the city in 1945. © Kyodo


Satellite imagery of suspected missile silos being constructed near Jilantai, pictured in November 2019. © Maxar Technologies/Getty Images

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