Abstract
In the wake of President Trump’s return to office in 2025, global supply chains have undergone accelerated geopolitical restructuring, with the United States redefining core industries—semiconductors, rare earths, steel, shipbuilding, and pharmaceuticals—as national security assets. As Washington increasingly conditions industrial cooperation on security alignment, Japan faces both pressure and opportunity to reposition itself within the evolving alliance-driven production architecture. Drawing on four strategic sectors, this report examines Japan’s responses to China’s tightening control over critical minerals, the U.S.–Japan alliance’s industrial deepening, and the broader securitization of supply-chain governance.
The rare-earth case demonstrates Japan’s shift toward multi-layered resilience through deep-sea resource development, technology substitution, and institutionalized cooperation with the European Union and the United States. The steel case analyzes Nippon Steel’s acquisition of U.S. Steel as a landmark in alliance-based industrial reconstruction, highlighting Japan’s use of political accommodation—such as golden-share arrangements—to secure strategic access to the U.S. market. In shipbuilding, rising military-civil fusion in China and Washington’s maritime rearmament have pushed Japan to reconsider industrial capacity, labor shortages, and standards harmonization with the U.S. and South Korea. The pharmaceutical case underscores Japan’s pursuit of “medical supply sovereignty” through onshoring of key APIs, regulatory reforms, and trilateral cooperation mechanisms aimed at strengthening supply-chain reliability.
Collectively, these cases illustrate Japan’s transition from a reactive participant to a potential institutional designer in the emerging security-centric economic order. The analysis also offers policy implications for partners such as Taiwan seeking to expand strategic participation in allied industrial networks.