More US nuclear weapons in Europe? Why, where, and when?

The United States currently maintains a nuclear presence in Europe through NATO’s “nuclear sharing” arrangements, primarily deploying B61 gravity bombs in five member states. Discussions regarding increasing this presence focus on deterring Russian aggression in Eastern Europe, particularly in Poland and the Baltics, as conventional forces are increasingly viewed as insufficient to prevent a large-scale conflict following Russia’s 2022 invasion of Ukraine.

By Marcus Thorne, Senior Security Analyst

For decades, the “nuclear umbrella” was a background assumption of European security—a silent guarantee that the United States would risk global catastrophe to prevent a Soviet, and later Russian, advance. But that silence has become a liability. As Russia repeatedly signals its willingness to use tactical nuclear weapons to enforce its “red lines” in Ukraine, the strategic calculus for NATO has shifted. The question is no longer whether the US should maintain its nuclear posture in Europe, but whether that posture must expand and move eastward to remain credible.

The thesis is straightforward: Conventional deterrence has failed to stop Russian territorial revisionism. To prevent a conflict on NATO soil, the US must not only maintain but strategically reinforce its nuclear presence on the Eastern Flank. Relying on the hope that Moscow will be deterred by Leopard tanks and F-35s is a gamble that ignores the Kremlin’s own nuclear doctrine.

Why is the debate over more US nuclear weapons in Europe intensifying?

The current urgency stems from a fundamental breakdown in the arms control architecture that governed the Cold War. According to reports from the Arms Control Association, the collapse of the Intermediate-Range Nuclear Forces (INF) Treaty in 2019 removed the limits on ground-launched missiles with ranges between 500 and 5,500 kilometers. This created a vacuum that Russia filled by deploying the 9M729 cruise missile, which NATO officials stated directly violated the treaty before its demise.

Beyond the treaties, the geopolitical reality on the ground has changed. The Russian invasion of Ukraine in February 2022 proved that the Kremlin is willing to launch a full-scale war to redraw borders. Since then, Vladimir Putin has frequently alluded to Russia’s nuclear arsenal as a tool to prevent Western intervention. This “nuclear blackmail” creates a psychological gap in NATO’s defense; if Russia believes the US will not risk a nuclear exchange to defend a Baltic state, the conventional defense of that state becomes a theoretical exercise.

Analysis from the Hudson Institute suggests that the American presence in Eastern Europe is irreplaceable because it provides the only “hard” guarantee of security that Russia respects. The logic is that while European nations can provide troops, only the US provides the nuclear deterrent that prevents a regional conflict from becoming a total war.

• Russian Nuclear Rhetoric: Frequent threats to use “tactical” weapons to achieve strategic goals.
• Treaty Erosion: The end of the INF Treaty allows for new classes of missiles in the European theater.
• Conventional Gap: The realization that conventional forces may not be enough to deter a nuclear-armed aggressor.

Where would additional US nuclear assets be deployed?

Currently, US nuclear weapons are stationed in Belgium, Germany, Italy, the Netherlands, and Turkey. This distribution is a relic of a different era, focused on Central and Southern Europe. The strategic center of gravity has shifted East. If the US decides to expand or relocate its nuclear footprint, the primary candidates are the “frontline states” on the Eastern Flank.

Poland is the most likely candidate for an increased presence. Warsaw has already aggressively expanded its conventional military capabilities and hosts a significant US troop presence. According to Polish defense officials, the goal is to create a “fortress” on the eastern border. Moving nuclear-capable assets—or the infrastructure to support them—into Poland would send a clear signal to Moscow that the “tripwire” for US intervention is now located directly on the border of the Kaliningrad exclave and Belarus.

The Baltic states (Estonia, Latvia, and Lithuania) present a more complex challenge. While these nations are the most vulnerable to Russian aggression, their small geographic size makes them high-risk targets in the opening minutes of any conflict. Deployment here would likely take the form of “rotational” capabilities or increased readiness for B-52 or B-21 bombers to operate from regional bases, rather than permanent silos or storage sites.

When would such a deployment happen?

A sudden move to place more nuclear weapons in Europe would be viewed by Moscow as a provocative escalation, potentially triggering the very conflict NATO seeks to avoid. Therefore, any expansion would likely follow a phased timeline tied to specific “trigger events.”

The first phase is already happening: the modernization of the B61-12 guided bomb. According to the US Department of Defense, the B61-12 provides greater accuracy and flexibility, reducing the yield required to destroy a target. This makes the “nuclear umbrella” more credible because the threshold for use is more nuanced. This modernization is an ongoing process throughout the 2020s.

The second phase would likely be triggered by a significant shift in Russian posture, such as the formal deployment of tactical nuclear weapons to Belarus—a move Vladimir Putin has already initiated. When Russia moves its weapons closer to NATO borders, the US is pressured to respond in kind to maintain the “balance of terror.” This “tit-for-tat” deployment cycle is the most likely timeline for an expansion of the US nuclear footprint in Europe.

Does increasing the nuclear presence increase the risk of war?

The strongest counter-argument to expanding the US nuclear presence is the “escalation ladder” theory. Critics, including some arms control advocates and European pacifist movements, argue that placing more nuclear weapons in Eastern Europe creates a “use it or lose it” dilemma. If Russia believes its targets in Poland or the Baltics are vulnerable to a first strike, it may be incentivized to strike first during a crisis.

This perspective suggests that nuclear weapons are “provocations” that force an adversary into a corner. They argue that the best way to avoid nuclear war is through disarmament and diplomatic guarantees, rather than strengthening the deterrent.

However, this argument ignores the reality of the last two years. Diplomacy did not stop the invasion of Ukraine. Disarmament treaties were ignored by the Kremlin. The “provocation” argument assumes a rational actor who responds to signals; it does not account for an aggressor who views the absence of a deterrent as an invitation to attack. In the logic of deterrence, the risk of a “miscalculation” is smaller than the risk of a “perceived weakness.” When the cost of aggression is perceived as low, war becomes more likely, not less.

“Deterrence is not about the desire to use weapons, but about the absolute certainty that using them would result in an unacceptable cost for the aggressor.”

Why conventional forces are insufficient for European security

There is a persistent belief in some European capitals that “more tanks” is the answer to the Russian threat. While conventional strength is necessary—and the 2023 NATO Strategic Concept emphasizes the need for increased readiness—it cannot replace the nuclear guarantee. This is due to the “asymmetry of risk.”

In a conventional war, a country can lose a battle and still survive. In a nuclear-armed world, the stakes are existential. Russia’s military doctrine explicitly allows for the use of nuclear weapons if the “existence of the state” is threatened. If NATO were to push Russian forces back from a captured territory using only conventional means, Moscow might perceive this as a threat to its regime’s survival and escalate to tactical nuclear weapons.

If the US does not have a visible and credible nuclear presence capable of responding in the European theater, the US is forced into a binary choice: accept a nuclear strike on its allies or escalate to a full-scale strategic exchange from the continental US. By having a nuanced, shared nuclear presence in Europe, the US creates “rungs” on the escalation ladder, allowing for a response that is proportional and deterrent without immediately triggering a global apocalypse.

Related explainer on NATO’s Nuclear Planning Group.

The political friction within the NATO alliance

Expanding the nuclear umbrella is not merely a military decision; it is a political minefield. Member states are not monolithic in their views. France, the only other nuclear power in NATO, often promotes “European strategic autonomy,” suggesting that Europe should rely less on the US and more on its own capabilities. However, France’s “force de frappe” is designed for national survival, not for the day-to-day deterrence of a Russian advance into Estonia.

Germany, meanwhile, struggles with a deep-seated cultural aversion to nuclear weapons. The presence of US bombs on German soil is a constant source of domestic political tension. Yet, the German government has recently shifted its tone, acknowledging that the security environment has fundamentally changed. The “Zeitenwende” (historic turning point) announced by Chancellor Olaf Scholz signals a willingness to accept harder security realities, even if they are politically unpopular at home.

The friction points can be summarized as follows:

• The US Perspective: Wants “burden sharing” and allies who are willing to accept the risks of deterrence.
• The Eastern Flank Perspective: Desires the maximum possible US commitment to prevent invasion.
• The Western European Perspective: Fears escalation and seeks a balance between deterrence and diplomacy.

Common misconceptions about nuclear sharing

One of the most frequent misunderstandings is the belief that “nuclear sharing” means the host countries (like Germany or Italy) “own” the weapons. This is false. Under current arrangements, the US maintains absolute custody and control of the warheads. The host nation provides the aircraft and the bases, but the “permissive action links” (the codes required to arm the weapons) remain exclusively with the US President.

Another misconception is that adding more weapons necessarily means adding more “bombs.” Strategic deterrence is often more about capability and visibility than raw numbers. A single squadron of B-21 Raider stealth bombers capable of penetrating Russian airspace is a more potent deterrent than a hundred stationary bombs in a warehouse. The debate over “more” weapons is often actually a debate over “better” and “more forward-deployed” capabilities.

The security of Europe is currently balanced on a knife’s edge. The era of assuming that “the West” is a monolithic shield is over. Russia has tested the edges of that shield and found them fraying. While the prospect of increasing nuclear assets in Europe is uncomfortable, it is a necessary response to a world where the rules of arms control have vanished and the cost of hesitation is measured in sovereign territory and human lives. The US must ensure that its nuclear umbrella is not just a theoretical promise, but a visible, credible, and forward-deployed reality.