Nuclear war is not imminent in the sense that a launch is expected or underway, but the risk of nuclear conflict is higher than at any point since the Cold War. The Bulletin of the Atomic Scientists moved its Doomsday Clock to 89 seconds to midnight in early 2025, the closest it has ever been to catastrophe since the clock’s creation in 1947. That assessment reflects a combination of active wars involving nuclear-armed states, collapsing arms control agreements, and expanding arsenals across multiple countries.
Understanding why experts are alarmed, and what still holds nuclear war in check, can help you separate genuine risk factors from panic.
Why the Risk Level Is Elevated
Three overlapping trends are driving concern. First, the war in Ukraine has placed Russian and NATO forces in closer proximity than at any time since the Cold War, and Russia has explicitly expanded the conditions under which it would consider using nuclear weapons. Second, conflict in the Middle East carries the potential to draw in additional nuclear-armed states. Third, the global arms control framework that kept arsenals in check for decades is falling apart.
The Bulletin’s 2025 statement put it bluntly: “national leaders and their societies have failed to do what is needed to change course.” The organization cited not just the wars themselves but the broader failure of high-level communication among nuclear powers, which it called “totally inadequate given the danger at hand.”
Russia’s Expanded Nuclear Doctrine
Russia updated its nuclear doctrine in late 2024, broadening the scenarios that could trigger a nuclear response. Under the revised policy, Moscow would treat an attack on Russia by any non-nuclear state that receives support from a nuclear state as a “joint attack,” potentially justifying a nuclear response. This language is widely interpreted as a warning aimed at Western nations supplying weapons to Ukraine.
The updated doctrine also states that Russia would consider nuclear use upon receiving “reliable information about a massive launch of air and space attack weapons” crossing its border, a category that now explicitly includes cruise missiles, drones, and hypersonic weapons, not just ballistic missiles. Russia further extended its nuclear umbrella to Belarus, reserving the right to respond with nuclear weapons to any attack on Belarus that “creates a critical threat to sovereignty,” even if that attack uses only conventional weapons.
Analysts at the Brookings Institution note that the credibility of these expanded triggers is debatable. Lowering the stated threshold for nuclear use can serve as a deterrent signal without reflecting actual intent. But the ambiguity itself is part of the danger: if one side misreads the other’s red lines, escalation can happen faster than diplomacy can intervene.
Global Arsenals Are Growing
Nine countries possess nuclear weapons, and their combined inventory totals roughly 12,100 warheads. About 3,900 of those are actively deployed on missiles or at bomber bases, ready for use on short notice. The United States holds approximately 5,244 total warheads (1,770 deployed), while Russia holds around 5,889 (1,710 deployed). Together, the two countries account for about 90% of the world’s nuclear weapons.
China’s buildup is the most dramatic shift in recent years. Its arsenal doubled from an estimated 300 weapons in 2020 to roughly 600 in 2025, and the Pentagon projects it will exceed 1,000 by 2030. China displayed five new nuclear delivery systems in a recent military parade, signaling that its expansion includes not just warheads but the missiles and platforms to deliver them. While still far smaller than the U.S. or Russian stockpiles, China’s growth complicates the math of deterrence because future arms agreements would need to account for three major nuclear powers rather than two.
Other arsenals are smaller but still consequential. The United Kingdom holds 225 warheads and recently scrapped a planned reduction, raising its ceiling to 260. France maintains 290. India and Pakistan each have roughly 170. North Korea is estimated to possess around 50 assembled warheads and has tested the Hwasong-18, a solid-fueled intercontinental ballistic missile with an estimated range exceeding 15,000 kilometers, enough to reach anywhere in the continental United States. Israel is believed to hold about 90 warheads, though it has never officially confirmed its arsenal.
Arms Control Is Collapsing
The New START treaty, the last major agreement limiting U.S. and Russian nuclear forces, is set to expire on February 4, 2026. Russia suspended its participation in the treaty’s inspection regime, and as of mid-2023, neither country had conducted any of the 18 on-site inspections allowed per year. Without verification, neither side can confirm the other is staying within agreed limits.
No successor agreement is under negotiation. The Intermediate-Range Nuclear Forces Treaty was already scrapped in 2019. The Anti-Ballistic Missile Treaty ended in 2002. When New START expires, there will be no legally binding limits on the nuclear arsenals of any country for the first time since the early 1970s.
The Bulletin of the Atomic Scientists noted that it is “no longer unusual for countries without nuclear weapons to consider developing arsenals of their own,” a trend that could multiply the number of potential nuclear conflicts and undermine decades of nonproliferation work.
What Still Prevents a Launch
Several layers of deterrence and safety remain in place. The core logic of mutually assured destruction has not changed: any country that launches nuclear weapons faces the near certainty of devastating retaliation, which gives every leader a powerful incentive not to go first.
Direct communication channels between major nuclear powers still function. The U.S. and Russia continue to observe a 1988 agreement requiring advance notification of strategic ballistic missile launches, reducing the chance that a test or accident is mistaken for an attack. Russia and China have a similar notification agreement. These hotlines are not as robust as full diplomatic engagement, but they provide a minimum safety net during a crisis.
Five NATO countries (Belgium, Germany, Italy, the Netherlands, and Turkey) host American B61 gravity bombs under nuclear sharing arrangements, reinforcing the alliance’s deterrent posture and reducing the incentive for individual European states to develop their own weapons.
Technical safeguards within command-and-control systems are designed to prevent unauthorized or accidental launches, though the specifics are classified. In 2024 and 2025, the Nuclear Threat Initiative convened senior dialogues with nuclear-armed states, calling on all of them to conduct internal “fail-safe” reviews of their nuclear command, control, and weapons systems. A group of 34 former officials from 12 countries endorsed the initiative, pushing for a joint statement at the upcoming NPT Review Conference in April 2026.
Risk vs. Imminence
The honest answer is that nuclear war is not expected or imminent, but the probability is not zero, and it is higher than it was a decade ago. The risks are real but they are driven by accumulating conditions (eroding treaties, expanding arsenals, active conflicts near nuclear-armed states) rather than by a specific countdown to a launch. The scenarios that worry analysts most are not a deliberate, planned first strike. They are accidents, misinterpretations of radar data, or an escalation spiral during a conventional war where one side feels cornered.
The gap between “elevated risk” and “imminent” is significant. Elevated risk means the guardrails are weaker than they used to be and the number of potential flashpoints has grown. Imminent would mean specific, actionable intelligence that a launch is being prepared, and no credible source is reporting that. What experts are warning is that the world is closer to the edge than it has been in a generation, and that the systems designed to pull it back are under more strain than at any point in their history.