Donald Trump’s pressure on NATO is accelerating a profound reassessment of European security. The alliance is not on the verge of collapse, but a more transactional United States is prompting European governments to spend more, diversify their military capabilities, and reconsider how much of their long term defense can depend on Washington.
Pressure is Producing Results
Trump’s central argument has remained consistent: European allies should assume a larger share of the costs and responsibilities of collective defense. Measured narrowly through spending commitments, this approach has produced tangible results. NATO reported that European members and Canada increased their combined defense spending by 20 percent in 2025, while all allies except Spain have agreed to devote 5 percent of GDP to defense and broader security related investments by 2035.
This shift is driven by more than American pressure. Russia’s full scale invasion of Ukraine in 2022 fundamentally altered threat perceptions across Europe, particularly among countries on NATO’s eastern flank. Nevertheless, Trump’s warnings about reducing the U.S. military commitment have made European governments more attentive to a longstanding vulnerability: many national defense plans have relied on the assumption that American forces, equipment, intelligence, and political leadership would remain readily available in a crisis.
The likely outcome is a Europe that is better armed and more prepared to carry a greater share of regional defense. Yet increased spending does not automatically resolve the alliance’s central political problem. NATO’s deterrence depends not only on military assets, but also on the belief that every ally will act if another is attacked under Article 5.
A Military Presence Still Matters
Despite sharp rhetoric and the prospect of troop reductions, the United States continues to rely heavily on Europe’s military infrastructure. Reuters reported that the U.S. has more than 81,000 personnel in Europe, although this total varies with rotations and deployments. The United States has also continued to fund major facilities in Romania, Spain, and Britain, demonstrating that European bases remain essential for operations extending into the Middle East, North Africa, and beyond.
This reveals an important contradiction. Washington may seek a more Europe led defense structure, but it still gains substantial strategic value from its continental presence. Bases in Spain, for example, provide access to the Atlantic and Mediterranean, while the expansion of Romania’s Mihail Kogalniceanu Air Base supports NATO’s posture near Ukraine and the Black Sea. Romania is investing about $2.7 billion in the project, with the aim of accommodating up to 20,000 personnel by 2040, alongside more than $100 million in U.S. investment.
As a result, a full American withdrawal would not simply weaken Europe. It could also reduce U.S. flexibility and reach at a time when Washington faces simultaneous challenges in Europe, the Middle East, and Asia.
European Autonomy Gains Momentum
The more consequential change may emerge in defense procurement. At least eight NATO members, including Canada, Poland, Denmark, France, Germany, Norway, Spain, and Turkey, are exploring ways to reduce reliance on U.S. weapons, technology, and defense firms. This does not necessarily signal a break with the United States. European countries still depend on American capabilities in areas such as advanced aircraft, missile defense, intelligence, and logistics.
However, the political uncertainty surrounding future U.S. commitments is creating incentives to develop alternative suppliers and domestic industrial capacity. Canada’s choice of a $1.7 billion Australian Arctic radar system over a U.S. competitor illustrates this emerging logic, particularly where non-U.S. systems can be delivered more quickly.
For Europe, greater autonomy could strengthen resilience by reducing exposure to potential supply disruptions or policy changes in Washington. For the United States, however, it could gradually weaken the commercial and technological ties that have reinforced transatlantic security for decades.
The Real Risk is Strategic Doubt
NATO is unlikely to break suddenly through a formal U.S. withdrawal. Congressional constraints, bipartisan support for the alliance, and the strategic importance of European bases all limit that possibility. Reuters found that officials in both major U.S. parties, as well as defense industry interests, retain significant influence in opposing a complete departure from NATO.
The greater risk is gradual erosion of confidence. If European leaders, publics, or potential adversaries doubt whether the United States would fulfill its commitments, deterrence becomes less credible even before any formal policy change occurs. Russia may test that uncertainty through pressure, sabotage, drone incursions, or other actions designed to probe NATO’s unity without triggering a full scale conflict.
A Final Note
Trump’s approach may ultimately create a NATO that is more financially balanced and militarily capable in Europe. Yet the alliance’s durability will depend on whether burden sharing can be achieved without undermining trust. A stronger Europe can reinforce NATO, but only if greater European capacity is paired with a credible and predictable transatlantic commitment.
