A legal mechanism allowing any member to withdraw from NATO has existed since the alliance’s founding, but European capitals have begun preparing for a scenario that, until recently, remained hypothetical: a United States departure from the mutual-defense pact. The procedure is governed by Article 13 of the North Atlantic Treaty, which permits a signatory to leave after 20 years of membership upon providing one year’s notice.
For the United States, a formal exit could be achieved either through a two-thirds Senate vote to ratify a treaty amendment or through a unilateral decision under Article 13 itself. No president has ever attempted to invoke that route, though reported threats of withdrawal surfaced in 2018 and 2020 without leading to formal action. The stakes are defined by the scale of the American contribution: the United States accounts for roughly 70 percent of NATO’s total defense spending and provides the alliance’s nuclear umbrella.
Losing that would strip the organization of its largest military contributor, altering the balance of security architecture that has underpinned European stability for decades.
Europe’s Defense Menu
European governments are no longer confining their planning to abstract discussions; they are constructing alternative frameworks. Four distinct options are under consideration.
The first is a deepening of the European Union’s own defense framework, known as PESCO (Permanent Structured Cooperation), which already includes 25 member states committed to joint defense projects. The second is a European nuclear deterrent, likely built around the arsenals of France and Britain–France holds approximately 290 warheads, and the United Kingdom maintains about 225. The third is a sharp increase in national defense spending to 3 percent or more of GDP, a benchmark that Poland has already reached.
The fourth is creation of an entirely new alliance, such as the European Security and Defence Union, a concept floated by French President Emmanuel Macron in 2017. These options are not merely proposals; they are backed by tangible funding and timelines.
The European Peace Facility, operating with a budget of €5.7 billion for the period 2021 to 2027, already finances military aid to partner nations. The EU’s Strategic Compass, adopted in March 2022, calls for a rapid deployment capacity of 5,000 troops to be operational by 2025. Both initiatives are funded, scheduled, and moving forward. Russia’s 2022 invasion of Ukraine acted as the decisive catalyst for this acceleration.
Finland ended decades of neutrality to join NATO in April 2023; Sweden followed in March 2024, bringing the alliance to 32 members. The underlying trend is unmistakable: European defense integration has advanced faster in the last four years than it did in the previous four decades.
The EU’s own defense instruments, including PESCO and the Strategic Compass, have gained fresh urgency as member states confront the prospect of managing their security without the full weight of American leadership.
The Security Gap and Historical Context
Any transition away from U.S. leadership would take years, leaving a security gap in the interim. No replacement structure can be built overnight, and NATO’s command-and-control architecture is deeply integrated with American systems, making a rapid handover impractical.
The alliance was established in 1949 as a military organization of European and North American states designed to provide collective defense against external threats. During the Cold War, it formed the core of Western deterrence against the Soviet Union and its satellite states under the Warsaw Pact. After the Soviet Union’s dissolution in 1991, NATO adapted by expanding eastward and taking on new missions in the Balkans, Afghanistan, and Libya, while maintaining the foundational principle that an attack on one member is an attack on all.
That principle, enshrined in Article 5, has been invoked only once–in response to the September 11, 2001, attacks. Article 13, the withdrawal clause, has never been tested.
Yet the concrete steps now being taken in European capitals–the funding commitments, the joint planning, the expansion of national defense budgets–signal that the possibility of a U.S. departure has moved from theoretical debate to active contingency planning.
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