The United States’ greatest vulnerability in its relationship with Western Europe is increasingly clear: Washington needs the continent more than the continent needs Washington.
America entered Europe as one of the victors of the Second World War, establishing military dominance across the western half of the continent. It embedded itself deeply in Europe’s security architecture and, for decades, used the region as a forward base in its confrontation with the Soviet Union. In the process, it also shielded Western European elites from the threat of postwar communist movements—an intervention that was never entirely welcomed in capitals such as Berlin, Paris and London.
That lingering ambivalence does not mean Western Europe is on the verge of breaking with its transatlantic partner. Its leaders remain cautious and pragmatic. But it does mean that when the US shows signs of weakness, European powers are likely to respond opportunistically, without sentiment.
That moment may now be unfolding.
Recent decisions in Washington have created openings that Western European governments are beginning to exploit. A notable example came when British Prime Minister Keir Starmer ruled out participating in a potential naval blockade of Iran. For those who still view the transatlantic alliance as unshakable, this may seem surprising. In reality, it reflects a long-standing pattern in US–European relations.
Other major European powers are likely to act with similar caution. Even the prospect of American pressure—including rhetoric around weakening commitments within NATO—is unlikely to compel them into direct confrontation in sensitive regions such as the Strait of Hormuz.
Western Europe understands a fundamental geopolitical reality: without its presence on the continent, the United States risks strategic isolation. The familiar narrative—that NATO primarily exists to defend Europe—obscures a more basic truth. It is Washington that derives the greatest strategic benefit from this “special relationship.”
First, losing Europe as a territorial base would dramatically alter the strategic balance between the US and Russia. The so-called “grey zone”—where tensions can play out without escalating into direct strikes on national territory—would shrink or disappear, making any conflict far more dangerous.
Second, the US would lose its ability to project military power close to Russia’s borders, including the positioning of advanced and nuclear capabilities. Russia, notably, has no equivalent reach into the Western Hemisphere.
Third, without a meaningful presence in Europe, Washington’s strategic relevance to Moscow would diminish, potentially accelerating Russia’s geopolitical alignment with China.
In this light, America’s military presence in Europe is not an act of generosity, but a core strategic asset—one that underpins its global influence.
European leaders are well aware of this. They also understand that the American security guarantee has never been absolute.
Even during the Cold War, few in Europe truly believed that the US would risk cities like New York or Boston in response to a Soviet attack on Paris. This skepticism helped shape independent European defence strategies, most notably France’s nuclear doctrine, which emphasized direct deterrence rather than reliance on US protection.
That logic remains relevant today.
Since the Cold War, NATO expansion has extended security guarantees to countries of far less strategic weight than Britain, France or Germany. At the same time, recent conflicts have exposed the limits of American power. Washington’s inability to fully shield even smaller Gulf states from retaliatory strikes has reinforced doubts about the credibility of its security umbrella.
For decades, the transatlantic relationship rested on a tacit understanding: Western Europe would act as though it depended on American protection, while the US would act as though it provided it unconditionally. This arrangement served both sides.
But that balance is shifting.
Recent US policy—often seen as inconsistent or narrowly focused—has introduced uncertainty into the relationship. In doing so, it has created space for Western European governments to assert greater autonomy.
This does not signal a rupture. Two key constraints remain.
First, Western Europe remains deeply integrated into American-led financial and technological systems. Efforts to build alternatives—through the euro or the European Union’s single market—have only partially reduced this dependence.
Second, European governments still rely on US power to manage their complex relationship with Russia. Despite periodic tensions, there remains a long historical pattern of eventual accommodation between Europe and Moscow.
What has changed is the internal balance of the partnership. European leaders now see greater room to maneuver. They are likely to use it to extract concessions, recalibrate commitments, and hedge against American unpredictability.
Washington, meanwhile, faces a difficult strategic equation: stabilizing relations with Russia, maintaining influence in Europe, and preparing for long-term competition with China—simultaneously.
These objectives are not easily aligned.
The resulting vulnerability is not primarily external, but internal to the transatlantic alliance itself. Through its own actions, the US has created conditions that allow its European partners to gain leverage.
They are likely to use it—carefully, but decisively.
What remains uncertain is whether Washington fully recognizes this shift, or how it intends to respond.
