The New Nuclear Arms Race: Predicting the Consequences of a World Without US-Russia Treaties

On February 5, 2026, a quiet but monumental shift occurred in global security: the New Strategic Arms Reduction Treaty (New START) officially expired. For the first time since the signing of the SALT I agreement in 1972, the United States and Russia are operating without any legally binding, verifiable limits on their deployed strategic nuclear forces.[1][6]

The expiration marks the dissolution of a bilateral arms control architecture that successfully guided the world through the latter half of the Cold War and the decades that followed. While the lapse of the treaty did not trigger an immediate, overnight deployment of new weapons, it fundamentally altered the psychological and operational foundations of nuclear deterrence, replacing structured transparency with strategic ambiguity.[4][7]

To understand the stakes of this transition, it is necessary to examine what New START actually did. Signed in 2010, the treaty imposed strict quantitative ceilings on the world's two largest nuclear arsenals. It limited both Washington and Moscow to 1,550 deployed strategic nuclear warheads and 700 deployed strategic delivery vehicles, such as intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and heavy bombers.[1][6]

Equally important to the numerical caps were the treaty's verification mechanisms. New START mandated regular data exchanges, notifications regarding the movement of strategic assets, and short-notice on-site inspections. These transparency provisions were designed to reduce uncertainty, prevent worst-case assumptions about the adversary's capabilities, and stabilize crisis signaling during periods of geopolitical tension.[3][7]

With the treaty's expiration, those verification mechanisms have vanished. The immediate concern among defense analysts is not necessarily the mass production of new missiles, but a mechanism known as 'uploading.' Both the United States and Russia possess thousands of non-deployed nuclear warheads in storage, and many of their existing delivery systems are designed to carry multiple warheads.[2][4]

Under New START, these Multiple Independently Targetable Reentry Vehicle (MIRV) systems were deliberately downloaded to carry fewer warheads than their maximum capacity to stay under the 1,550 limit. Without the treaty's constraints, either nation could theoretically upload hundreds of reserve warheads onto their existing ICBMs and submarines in a matter of weeks or months, effectively doubling their deployed forces without building a single new missile.[2][7]

The financial implications of an unconstrained environment are also profound. Maintaining and modernizing nuclear arsenals is extraordinarily expensive. A renewed quantitative arms race—where both sides feel compelled to match the other's uploaded warheads to maintain parity—would divert hundreds of billions of dollars away from conventional military readiness, emerging technologies, and domestic priorities.[2][5]

However, the 2026 nuclear landscape is vastly different from the bipolar standoff of the Cold War. The most significant complicating factor in negotiating a successor to New START is the emergence of a multipolar nuclear environment, driven primarily by China's rapid expansion of its strategic forces.[1][4]

Over the past several years, Beijing has significantly modernized and expanded its nuclear arsenal, constructing extensive new silo fields and advancing its delivery capabilities. While China's total warhead count remains a fraction of the US and Russian stockpiles, the trajectory of its growth has fundamentally altered Washington's strategic calculus.[4][7]

The United States has increasingly insisted that any future strategic arms control framework must include China, arguing that bilateral limits are insufficient in a three-peer environment. Beijing has consistently rejected this premise, maintaining that it should not be bound by ceilings designed for superpower arsenals that are several times larger than its own, and insisting that Washington and Moscow must first reduce their stockpiles to Chinese levels.[1][7]

Despite the formal expiration of New START, there are pathways to mitigate the risks of an unconstrained arms race. In the months leading up to the treaty's lapse, Russian leadership proposed a voluntary, mutual commitment to observe the treaty's numerical limits for an additional year, provided the United States reciprocated.[1][5]

While formal acceptance of such proposals remains politically complex, there is historical precedent for informal restraint. In 1981, the United States and the Soviet Union agreed to abide by the unratified SALT II treaty, which helped preserve a degree of strategic stability while the parties negotiated what would eventually become the START I agreement.[5][7]

The international community is also exerting pressure on the major powers to resume dialogue. The expiration of New START coincides with the 2026 Review Conference of the Nuclear Non-Proliferation Treaty (NPT). Non-nuclear-weapon states are increasingly vocal about the obligations of the nuclear powers under Article VI of the NPT, which commits them to pursue negotiations in good faith on effective measures relating to nuclear disarmament.[3][6]

Ultimately, the world without New START is not necessarily destined for an immediate, spiraling arms race, but it is undeniably a period of elevated risk and reduced transparency. The challenge for the coming years will be designing a new generation of arms control—one that moves beyond Cold War bilateralism to address the complexities of a multipolar world, emerging technologies, and the enduring imperative of strategic stability.[4][5][7]