Why It Matters

The Trump administration is increasing military cooperation with Japan while simultaneously pursuing trade policies that could impose new economic pressure on one of the United States' closest allies.

A Congressional Research Service report examining U.S.-Japan relations shows the administration has maintained Biden-era military cooperation while pursuing trade investigations that could result in additional tariffs. Japan also faces mounting security and economic pressure from China, including restrictions on critical mineral and dual-use exports, as tensions surrounding the Taiwan Strait increase.

The Big Picture

The administration has continued the reconstitution of U.S. Forces Japan into a joint force headquarters while encouraging Tokyo to accelerate its defense buildup. Japan moved up its target for reaching defense spending equivalent to 2% of GDP from fiscal 2027 to fiscal 2025.

Japan has also committed to acquiring 400 Tomahawk cruise missiles from the United States through Foreign Military Sales. However, the United States has warned Japan that deliveries could face delays as U.S. military operations against Iran have strained American Tomahawk inventories.

The economic relationship carries both opportunity and friction. Under a framework agreement announced in July 2025, the United States established a 15% baseline tariff framework for nearly all Japanese imports. Japan committed to fund up to $550 billion in investments in strategic U.S. sectors before 2029, increased purchases of agricultural goods, aircraft, defense equipment and energy, and agreed to ease certain domestic regulations affecting U.S. products.

Japan is also among the economies facing a Section 301 investigation into practices related to structural excess capacity and production in manufacturing. USTR initiated the investigation in March, identifying Japan alongside China, the European Union, South Korea and other economies. The investigation could ultimately result in additional tariffs or other trade actions.

Geopolitically, Japan-China relations have grown more tense. China responded to Japanese Prime Minister Sanae Takaichi's statements about a potential Taiwan conflict with punitive measures that CRS says included restrictions on Japanese seafood and critical mineral and other dual-use exports, as well as increased Chinese military activity around Japan's southwestern islands.

H.Res. 971, H.Con.Res. 71 and S.Res. 547 would condemn China's coercive actions against Japan and express support for Japan in connection with peace and stability across the Taiwan Strait. H.Res. 971 specifically describes Japan as a vital U.S. ally and condemns China's economic and military pressure following Takaichi's statements.

The Bottom Line

The Trump administration's approach to Japan combines deeper military cooperation with continuing economic pressure. The two countries have expanded defense coordination and reaffirmed their alliance while implementing a trade framework that includes Japanese investment commitments and a 15% tariff structure.

At the same time, the administration's Section 301 investigation creates the possibility of additional trade action against Japan. Congress therefore faces questions about whether escalating trade pressure could complicate economic relations with an ally that Washington increasingly relies on as part of its strategy to deter China and maintain stability in the Indo-Pacific.

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