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In Europe, and now Asia, confidence in US support wavers

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Iori Sagisawa/Reuters
Chinese President Xi Jinping in Beijing, April 15, 2026. Mr. Xi is expected to meet with U.S. President Donald Trump later this month.

Thousands of miles from the Persian Gulf, economic and political shrapnel from the Iran war has left longtime American allies nervous about the staying power and stability of their partnerships with the United States.

The most recent spillover from the war has come in Europe: last week鈥檚 sudden decision by U.S. President Donald Trump to withdraw 5,000 American troops from Germany.

But it鈥檚 also been buffeting allies in the Asia Pacific, an area of the world Mr. Trump has made a primary foreign policy priority, ahead of his scheduled visit to Beijing later this month for talks with Chinese leader Xi Jinping.

Why We Wrote This

Ahead of President Donald Trump鈥檚 expected visit in Beijing with Chinese leader Xi Jinping, longtime American allies in Europe and Asia remain on edge about the strength of their partnership with the United States.

Even before the war, Mr. Trump鈥檚 use of tariffs to secure U.S. economic interests and his insistence that partners in both Europe and Asia significantly increase defense spending had made it clear the terms of engagement with the White House were changing.

But allied leaders were hopeful of being able to deliver the kind of loosened American commitment Mr. Trump wanted. And they were assuming U.S. officials would recognize that this transition would inevitably take time.

The Iran war 鈥 launched alongside Israel without consulting other U.S. partners, and hitting their economies far harder than America鈥檚 鈥 delivered a jolt of an entirely different order.

The war, and Mr. Trump鈥檚 unconcealed anger at their refusal to join it, have led many allies to question whether their previous expectation of a gradual, mutually managed move to a less taxing U.S. commitment remains doable.

They will still hope so.

European allies,聽especially Germany,聽have been ramping up military spending in anticipation of taking on the main responsibility for securing the continent against Russian aggression. But, for now, the U.S. remains critical to making that deterrent credible.

Japan, South Korea, and other partners in Asia face a similar challenge: Even as they devote more resources to defense, they still need American support to deal with the threat from North Korea, as well as the growing ambition and assertiveness of China.

Lee Jin-man/AP
Protesters hold signs against U.S. President Donald Trump's demands to multiple countries to send warships to keep the Strait of Hormuz open, near the U.S. Embassy in Seoul, South Korea, March 16, 2026.

However, especially since the launch of the Iran war, they鈥檝e sensed that President Trump views them less as valued partners than as mere afterthoughts聽鈥 or mere annoyances.

Last Friday鈥檚 announcement of the American troop drawdown was not, in itself, concerning. Germany and other European members of the NATO alliance have already accepted that U.S. troop numbers will be reduced as Europe assumes a larger military role.

But the nature and timing of the decision were unsettling.

It followed German Chancellor Friedrich Merz鈥檚 unguarded criticism of the Iran war in remarks to a group of high school students, and his suggestion that Iran had 鈥渉umiliated鈥 the U.S. The troop withdrawal announcement, officials , was meant as a punitive strike.

And far from suggesting the kind of coordination European allies hope to see in a stable realignment of security obligations, it came out of the blue. A NATO spokesman was reduced to telling reporters that alliance leaders were trying to find out exactly what it meant.

Markus Schreiber/AP
German Chancellor Friedrich Merz speaks to media in Berlin, May 4, 2026. Mr. Merz recently suggested that Iran had "humiliated" the U.S. in their war, leading to a drawdown of U.S. troops stationed in Germany.

Allies in Asia have been on the receiving end of what they feel is similarly casual treatment, a particular concern ahead of a Trump-Xi summit, whose outcome will affect not just U.S. interests, but theirs as well.

The Quadrilateral Security Dialogue, known as the Quad, brings together the U.S., Japan, India, and Australia 鈥 a democratic counterweight to China鈥檚 expanding influence that seemed an important part of Mr. Trump鈥檚 heightened focus on Asia in the early months of his second term.

But of a meeting with alliance leaders last year amid a falling out with Indian Prime Minister Narendra Modi. Ties with Japan and Australia have more recently been strained over trade, defense spending, and now the Iran war, dashing hopes that he might stop on the way to the Beijing summit to meet Quad leaders.

Japan and America鈥檚 other main Asian military allies聽鈥 South Korea and the Philippines聽鈥 are hugely dependent on energy imports passing through the war-choked Strait of Hormuz.

They鈥檝e been careful to avoid public criticism of the war.

But like the European allies, they鈥檝e been left unsettled by Mr. Trump鈥檚 public criticism of U.S. partners鈥 refusal to help open the strait by force.

A measure of the depth of allied concern over future ties with America has been a recent expansion of regional defense and security cooperation.

Julia Demaree Nikhinson/AP
Japanese Prime Minister Takaichi Sanae delivers remarks alongside President Donald Trump during a visit to the White House, March 19, 2026.

Western Europe鈥檚 political heavyweights 鈥 Germany, France, and Britain 鈥 have increasingly joined Poland, Scandinavia, and the Baltic states in coordinating moves to support Ukraine and restrain Russia from further military aggression.

In Asia, Japan is expanding its weapons production. It also recently ended a restriction on arms exports, a move which has already led to an agreement to transfer several Japanese warships to the Philippines.

Especially if this week鈥檚 reports of a possible U.S.-Iran peace deal are borne out, there might well be efforts on all sides to repair the economic and diplomatic fallout from the war.

In 2018, during his first term, Mr. Trump told the annual World Economic Forum in Davos, Switzerland, that 鈥淎merica first does not mean America alone.鈥

But the war has left allied leaders less confident that their voices, or their concerns, matter.

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