The Erosion of Nuclear Restraint

The demise of New START occurs at a particularly dangerous juncture. China is rapidly modernizing and expanding its nuclear arsenal, and geopolitical tensions between the United States, Russia, and China are intensifying. This confluence of factors creates a volatile environment ripe for a three-way nuclear arms competition. Such a competition wouldn’t necessarily involve a massive increase in total warhead numbers, but rather a qualitative race to develop more sophisticated and destabilizing weapons systems.

The potential consequences are deeply concerning. Experts widely agree that the risk of nuclear conflict is higher now than it has been in decades. The Council on Foreign Relations’ Global Conflict Tracker highlights numerous hotspots where nuclear escalation, even accidental, is a real possibility. While the exact number of warheads may not be the sole determinant of risk, the absence of transparency and communication channels significantly amplifies the danger.

The Value of Arms Control Agreements

Nuclear agreements provide critical advantages beyond simply limiting the quantity of weapons. They foster predictability, reducing the pressure to build up arsenals based on worst-case scenarios. Transparency, through data exchanges and inspections, allows each side to better understand the capabilities and intentions of others. They also reduce incentives for a first strike by banning or limiting particularly dangerous weapons, and, crucially, improve relations by signaling a willingness to coexist and avoid mutual destruction.

The lessons of the Cold War are stark. Following the Cuban Missile Crisis in 1962, President John F. Kennedy recognized the inherent dangers of relying solely on nuclear deterrence. He swiftly pursued the Limited Test Ban Treaty in 1963 and established a direct communication line with Moscow – a hotline designed to prevent accidental war. Every U.S. president since has, in some form, sought to maintain arms control agreements. The Arms Control Association provides a comprehensive history of these efforts.

Furthermore, the non-proliferation regime, embodied by the Nuclear Nonproliferation Treaty, relies on the commitment of nuclear-armed states to pursue disarmament in good faith. As pressure mounts on non-nuclear states to acquire their own weapons, maintaining this regime requires demonstrable restraint from those already possessing them.

Challenges and Criticisms

Critics rightly point to instances of past treaty violations by Russia and accusations leveled against China regarding illicit nuclear testing. However, despite these issues, the core elements of these agreements were largely implemented, and, as former Secretary of State Marco Rubio noted, they demonstrably “left the United States safer.” Over four-fifths of the world’s nuclear weapons have been dismantled since the height of the Cold War.

Looking ahead, the path is unclear. While President Trump expressed a desire to negotiate a “better” deal encompassing U.S., Russian, and Chinese forces, including non-strategic weapons, no formal negotiations are currently underway. Simultaneously, there’s growing pressure in Washington to expand U.S. nuclear capabilities as a deterrent to both Russia and China, and to address the threat posed by North Korea. The U.S. possesses hundreds of stored nuclear weapons that could be redeployed, and is actively developing new systems, such as a nuclear-armed, sea-launched cruise missile.

Do these developments signal an inevitable escalation, or is there still room for diplomacy? And what role will emerging technologies, like artificial intelligence, play in shaping the future of nuclear strategy?

Frequently Asked Questions About Nuclear Arms Control

• What is the New START treaty and why did it expire? The New START treaty was a bilateral agreement between the United States and Russia that limited the number of deployed strategic nuclear weapons. It expired on February 5, 2026, as no extension or replacement agreement was reached.
• Why is China’s nuclear buildup a concern? China’s rapid expansion of its nuclear arsenal is destabilizing because it introduces a third major nuclear power into the equation, increasing the complexity and risk of miscalculation.
• What are “nonstrategic” nuclear weapons and why are they important? Nonstrategic nuclear weapons are those designed for use on the battlefield or in regional conflicts. Their inclusion in any future arms control talks is a major sticking point.
• Could the expiration of New START lead to a new nuclear arms race? Yes, the absence of limits and transparency mechanisms increases the risk of a renewed arms race, as each country may feel compelled to build up its forces in response to perceived threats.
• What are the potential consequences of a nuclear conflict? A nuclear conflict, even a limited one, could have catastrophic consequences for global security, the environment, and human health.
• What is the role of the Nuclear Nonproliferation Treaty (NPT)? The NPT aims to prevent the spread of nuclear weapons and promote disarmament. Its effectiveness is undermined when nuclear-armed states do not demonstrate a commitment to arms control.