Trump NATO Withdrawal Threat Could Leave Europe Vulnerable for Decades – According to a study by the International Institute for Strategic Studies (IISS), President Donald Trump’s threat to withdraw from NATO, and to remove American soldiers from the continent, could create a “window of vulnerability” for the continent that could last as long as a quarter of a century. The news serves as a warning to Europe that not enough is being done to defend the continent against potential future invasions by Russia or other neighboring superpowers.
What the Study Claims: NATO Crippled for Decades
Published on Thursday, May 15, 2025, the IISS study breaks down the impact of a hypothetical U.S. withdrawal from Europe, describing the financial and military impact a decision like that would have on the continent.
Specifically, the report describes how European leaders could be forced to make “stark choices” about how to replace American military power as nations across the continent work to rebuild their caches of military hardware and dramatically increase the number of soldiers in their respective armies.
The aim of the study, researchers say, is to “inform the European defence policy debate” by presenting possible implications of a U.S. withdrawal in the event that the war in Ukraine comes to an end as a result of a U.S. government-negotiated ceasefire agreement.
The study first assesses Russia’s ability to reconstitute its forces after the fighting ends, noting that the country “could be in a position to pose a significant military challenge to NATO allies, particularly the Baltic states, as early as 2027.” Researchers argue that Russia’s ground forces could by then mirror its February 2022 active equipment holdings “through a combination of refurbishment and the production of new systems.”
Researchers determined that Europe would quickly face a “window of vulnerability” defined by European allies’ need to replace major U.S. military platforms and as many as 128,000 troops. Additionally, researchers concluded that European states would be forced to address major shortfalls in space and all-domain intelligence, surveillance, and reconnaissance assets. And, to replace all current U.S. conventional capabilities, European states would need to make major additional investments on top of existing plans to boost their collective military capacity.
Industrial Challenges for NATO
As part of rebuilding European troops and military capabilities, European states would first need to address industrial shortfalls.
Specifically, researchers noted that even as procurement orders have increased in recent years, there has been “less urgency in the naval and much of the aerospace sector, with little additional investment in more production capacity.”
The IISS warned that Europe’s defense industry is ill-prepared and that while European procurement has accelerated in the land sector, naval and aerospace investments remain sluggish, with limited production expansion in recent years. This shortfall, the report explains, will be compounded by broader industrial issues, including contract complexity, financing gaps, workforce shortages, and regulatory constraints – potentially forcing European states to make major legislative and procurement changes.
Even by addressing these problems, however, the research suggests that Europe will not be able to replace U.S. air and maritime assets within the next decade at least – unless new sources of major investment allow for the rapid development of domestic industrial capabilities.
Land-based capability gaps are likely to be the first shortfall addressed by European leaders in the event of a full U.S. withdrawal from the continent, while progress in other areas will require either foreign purchased or longer lead times – particularly for assets like rocket artillery and stealth aircraft that cannot be produced by existing industrial operations.
Reshaping Europe’s Relationship with the U.S.
If the new IISS assessment holds true, Europe not only faces procurement challenges but serious implications from making difficult decisions.
Increased reliance on foreign arms suppliers, for example, would compromise Europe’s strategic autonomy – not simply because arms would be sourced from overseas, but because it could weaken the continent’s security of supply and create potential constraints on defense capabilities. Foreign suppliers may restrict exports of weapons, ammunition, or spare parts as a result of their own national interests, leaving European militaries unable to operate or properly maintain existing systems.
It is also not uncommon for foreign states to use arms sales as leverage in diplomacy. Should Europe become dependent on foreign suppliers, the continent may be pressured to align politically with that supplier’s foreign policy, harming strategic partnerships with the United States and potentially forcing continental leaders to choose between favorable deals with its transatlantic ally and weapons suppliers.
The UK In a Bind
For global powers like the United Kingdom, it could also prove embarrassing. Despite its status as a major military power, the British Army only has approximately 73,847 regular personnel as of January 2025. Some reports also suggest that the British military also only has between 20 and 25 Challenger 2 tanks in operation, and while 148 Challenger 3 tanks are expected to be received this year, delivery is not the same as deployment. Full operational readiness may take years. Crews must be trained, maintenance logistics developed, and older tanks phased out. According to the British Ministry of Defence, all 148 Challenger 3 tanks may not be in service until 2030.
With British Prime Minister Keir Starmer already forging new agreements with the European Union after years of Brexit uncertainty, there remains a possibility of renewed discussions about the United Kingdom participating in, or working closely with, a new European Army. The prospect of a U.S. withdrawal from NATO has reignited debates about forming a unified European army, and while some leaders support the idea, significant obstacles remain, including the lack of a permanent EU military command structure and the requirement for unanimous consent among member states for joint missions.
NATO In Decline After American Withdrawl
A U.S. withdrawal from Europe, therefore, not only exposes Europe to military invasions over the next 25 years, as the IISS suggests, but could weaken its diplomatic, political, and military relationship with the United States by forcing nations to forge new relationships with foreign powers.
That prospect alone could, therefore, make President Trump reconsider the idea – but with just over three and a half years left of his administration, and the president already quickly disrupting the status quo as part of his effort to reshape the country before he leaves office radically, everything seems to be on the table.
About the Author:
Jack Buckby is a British author, counter-extremism researcher, and journalist based in New York. Reporting on the U.K., Europe, and the U.S., he works to analyze and understand left-wing and right-wing radicalization, and reports on Western governments’ approaches to the pressing issues of today. His books and research papers explore these themes and propose pragmatic solutions to our increasingly polarized society. His latest book is The Truth Teller: RFK Jr. and the Case for a Post-Partisan Presidency.
