The Shift Toward Transactional Diplomacy in Transatlantic Security
For decades, the presence of American boots on European soil was viewed as a cornerstone of collective security—a shield against aggression and a symbol of an unbreakable bond. However, we are entering an era where security is increasingly treated as a transaction rather than a treaty obligation.
The recent discussions regarding the withdrawal of US troops from Germany, Italy, and Spain signal a pivot. When security guarantees are tied to political alignment on specific conflicts—such as the ongoing war with Iran—the nature of the alliance changes. We are seeing a move toward a support-to-stay
model, where the US leverages its military footprint to demand absolute diplomatic and economic synchronization from its allies.
This trend is not limited to troop counts. The friction stems from a fundamental disagreement over strategy. German Chancellor Friedrich Merz recently highlighted this rift, suggesting the US lacked a truly convincing strategy
to end the conflict with Iran, although arguing that the war has a direct impact on our economic output
.
European Strategic Autonomy: A Forced Evolution
If the US continues to review its troop levels in Europe, the European Union will be forced to accelerate its drive toward strategic autonomy
. For years, European leaders have discussed the need for a more independent defense posture, but the reality of a US withdrawal would turn this theoretical goal into an urgent necessity.
The potential removal of troops from Italy, which hosted 12,662 active-duty soldiers as of late 2025, or Spain, with its 3,814 personnel, would create security vacuums in the Mediterranean. This could lead to:
- Increased Defense Spending: A surge in national military budgets across the EU to replace US capabilities.
- Unified Command Structures: A move toward a more centralized European military command to coordinate defense without relying on US European Command (USEUCOM).
- Diversified Alliances: European nations may seek new security partnerships to stabilize regions like the Strait of Gibraltar.
The tension is palpable. When asked about pulling troops from Italy and Spain, Donald Trump questioned the utility of the relationship, stating, Italy has not been of any help to us and Spain has been horrible, absolutely horrible
.
The Logistics Vacuum: More Than Just Soldier Counts
To understand the risk of troop withdrawals, one must look beyond the raw numbers. The US military presence in Europe functions as a global logistical spine. These bases are not just for defending Europe; they are hubs for projecting power into the Middle East and Africa.
“The bases haven’t only served to safeguard Europe’s security: They have also been critical for US military and foreign policy goals beyond Europe.” Analysis of US military infrastructure in Europe
A primary example is the Landstuhl Regional Medical Center in Germany. As the largest American hospital outside the US, it serves as the primary evacuation and treatment center for forces operating in Europe, the Middle East, and Africa. A significant reduction in personnel or the closure of such facilities would severely hamper the US’s ability to sustain long-term operations in distant theaters, including the current conflict in Iran.
Economic Warfare and the Security Link
The intersection of trade and security is becoming the primary driver of transatlantic relations. The current threats to withdraw troops are occurring alongside disputes over US tariffs and aid to Ukraine. This suggests a strategy where military presence is used as a bargaining chip in economic negotiations.
The war with Iran has exacerbated this. With the Strait of Hormuz effectively choked by a US blockade and Iranian restrictions, the global economy is feeling the strain. The US expects its allies to shoulder the burden of reopening this vital shipping lane, and the lack of perceived support from leaders like UK Prime Minister Keir Starmer has led to public diplomatic clashes.
For those tracking these trends, the key is to watch the NATO defense spending metrics and the status of rotational forces in Eastern Europe. While permanent bases in Germany or Italy may be under review, the US has maintained a rotational presence in Poland (approximately 10,000 personnel) to bolster the Russia-facing flank, suggesting that the US may prioritize “threat-based” positioning over “relationship-based” positioning.
Frequently Asked Questions
As of December 2025, the US had approximately 68,064 active-duty military personnel stationed in Europe.
Germany hosts the largest contingent with 36,436 personnel, followed by Italy with 12,662 and the United Kingdom with 10,156.
Current tensions are largely driven by disagreements over the handling of the war with Iran and a perceived lack of support from European allies in achieving US strategic goals.
While the president and the Department of Defence typically create these decisions, Congress can complicate or block major withdrawals through legislation and funding controls.
Join the Conversation: Do you believe European nations should strive for full military independence, or is the US presence still essential for global stability? Share your thoughts in the comments below or subscribe to our geopolitical newsletter for weekly deep dives.
