Prime Minister Sanae Takaichi’s recent summit with US President Donald Trump yielded a range of outcomes. The Brief analyses the reasons why Japan saw the summit as a success. It argues that, beyond the obvious interest in keeping the US invested in the Indo-Pacific region and in Japan’s security, Japan may have seen the summit as an opportunity to buy time for a military build-up and to display ideological alignment with Trump’s objectives in West Asia and beyond.

The Japan–US Summit Meeting

On 18 March 2026, Japan’s Prime Minister, Sanae Takaichi, embarked on a three-day visit to the United States of America for a summit meeting with President Donald Trump.[i] Her visit occurred at a time when the US, along with Israel, was in the midst of offensive operations against Iran. A key background question during her visit concerned the likelihood that Trump would demand Japan’s participation in any effort to ‘open’ the Strait of Hormuz, a demand he had previously made of all transatlantic and transpacific partners.

The summit yielded several outcomes on current issues. On the ongoing conflict in Iran, Takaichi conveyed Japan’s consistent stance that Iran should not be allowed to possess nuclear weapons. She also condemned the closure of the Strait of Hormuz and Iran’s attacks on ‘surrounding areas’.[ii] However, she stopped short of providing military assistance as demanded by the US. Foreign Minister Toshimitsu Motegi, who accompanied the Prime Minister, later told reporters that President Trump ‘listened attentively’ and ‘nodded in agreement’ when she explained that constitutional limitations prevented Japan from deploying military assets to the region.[iii]

In the final statement, the Japanese side restricted itself to calling for an ‘early de-escalation of the situation’. It repeated its traditional boilerplate regarding the need for ‘peace and stability’ in the region. However, a particular sentence at the end of the section on Iran raises an interesting question about Japan’s interest in supporting US priorities. The sentence asserted that ‘we [the two leaders] would like Japan and the United States to work together to expand the production of US-sourced energy, taking into account crude oil procurement needs in Japan and across Asia’.[iv] Unpacking this statement raises intriguing questions: Does Japan intend to supply US crude to Asian markets? Alternatively, does it intend to urge partners to buy US crude (as opposed to, say, Russian crude)? Further developments in this area bear greater scrutiny.

In the Indo-Pacific, Takaichi secured some buy-in from Trump for the Free and Open Indo-Pacific concept. Each of the Quad countries was mentioned as a key node in a ‘network of like-minded countries’, though the word itself remained unmentioned. What is distinctive here is that, while issues relating to China were resolved in one sentence, there was extensive discussion of North Korea-related issues. The Japanese leader apparently sought and received assurances from Trump on continued US commitment to the ‘denuclearisation of the Korean peninsula’ and the resolution of the long-pending abduction issue.[v]

The Summit resulted in the release of four key joint documents. The first, a Joint announcement on Strategic Investment, reviewed the progress of the initial batch of Japanese investments in the US announced in February in fulfilment of the US–Japan trade agreement signed in September last year.[vi] The Joint Statement also announced a new round of projects, comprising Small Modular Reactor construction by a consortium led by GE Vernova and Hitachi in Tennessee and Alabama (costing US$ 40 billion), as well as two natural gas infrastructure construction projects in Pennsylvania (US$ 17 billion) and Texas (US$ 16 billion).[vii]

The second key document was an Action Plan for Critical Minerals Supply Chain Resilience. This document states in its preamble that, due to ‘distortions resulting from pervasive non-market policies and practices’, the critical minerals supply chain remains vulnerable to disruption such as economic coercion. Under the Action Plan, the US and Japan would therefore ‘seek to develop a plurilateral trade initiative in critical minerals supported by price floors or other measures’. The aforementioned initiative would establish price floors, set technical and regulatory standards for........

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