Flashpoints | Diplomacy | East Asia

Testing the Japan-South Korea-US Techno-Alliance

Guided by geopolitical realities, the framework is recalibrating into a highly practical alliance centered on advanced technology and economic security.

As Japanese Prime Minister Takaichi Sanae nears her first half-year in office, alongside the administrations of U.S. President Donald Trump and South Korean President Lee Jae-myung, East Asia’s geopolitical landscape is coming into sharper focus. The transition periods have passed, revealing the substantive policy directions of these three leaders. 

Initially, many foreign policy analysts expressed concern about the future of the Japan-South Korea-U.S. trilateral. They feared that the intersection of Trump’s “America First” agenda, Lee’s pragmatic diplomacy, and Takaichi’s conservative nationalism might unravel the partnership forged at the 2023 Camp David summit. Observers anticipated a divergence in their respective national strategies.

However, nearly half a year into Takaichi’s tenure, the trilateral framework has not collapsed; rather, it has transformed. The partnership is driven by the need to counter the security threats of North Korea, China, and Russia. Guided by these geopolitical realities, the framework is recalibrating into a highly practical alliance centered on advanced technology and economic security. 

This shift was prominently displayed at the fifth Trans-Pacific Dialogue (TPD) in Washington, D.C. on February 20 and 21. While deterring Pyongyang’s advancing nuclear and missile capabilities remains a foundational priority, high-level officials made it clear that the frontier of alliance and cooperation have expanded. South Korean National Security Adviser Wi Sung-lac noted that the three nations are deepening dialogues on critical mineral supply chains, artificial intelligence, quantum computing, and next-generation nuclear energy.

This aligns with the current domestic imperatives of all three administrations. The Trump administration is seeking to maintain a competitive edge in the global technology sector while revitalizing domestic manufacturing. Lee, prioritizing economic stability, aims to secure South Korea’s future growth engines amid global uncertainties. Concurrently, Takaichi’s government has firmly positioned economic security as a top national priority over the past half-year, integrating it with defense and industrial policy to create a “Strong Japan” agenda. As U.S. Deputy Secretary of State Christopher Landau observed, the three countries are actively coordinating to secure the supply chains vital for future industries, effectively building a technological partnership based on mutual economic interests.

Despite this pragmatic convergence, the newly formed techno-alliance remains highly vulnerable. The framework rests on precarious ground, with two substantial structural challenges: the unpredictability of U.S. trade policies and the unresolved historical grievances between South Korea and Japan.

The first significant risk stems from the contradictory nature of current U.S. economic statecraft. Washington is actively encouraging South Korea and Japan to integrate their semiconductor and AI ecosystems, aiming to reduce allied reliance on Chinese supply chains. Simultaneously, however, the Trump administration launched a Section 301 trade investigation on March 11, targeting countries including South Korea and Japan. The prospect of Washington imposing heavy tariffs on the very allies it needs for its technology strategy creates a profound strategic friction.

Such punitive economic measures risk undermining the mutual trust necessary for genuine cooperation. For the Lee administration, this presents a delicate political dilemma with mounting economic realities. South Korean corporations are currently grappling with a dual burden: a........

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