The Deepening of the Alliance and Remaining Challenges Indicated by the Japan-U.S. Extended Deterrence Dialogue: An Analysis of the Discussions in February 2026

On February 18, 2026, the U.S.-Japan Extended Deterrence Dialogue (EDD) held at the State Department in Washington, D.C., marked an important milestone in the current state and future direction of the U.S.-Japan alliance under the Trump administration and Prime Minister Sanae Takai's government. This dialogue was co-chaired by representatives from the U.S. State Department and the Department of Defense, and from Japan's Ministry of Foreign Affairs and Ministry of Defense, with additional participation from representatives of the Joint Chiefs of Staff, U.S. Strategic Command, and the Indo-Pacific Command. According to a statement released by the U.S. State Department on February 21, both countries agreed to promote the common resolve of President Trump and Prime Minister Takai to "further strengthen the alliance's deterrent and response capabilities."

The most significant aspect of this dialogue was the reaffirmation of the U.S. commitment to defend Japan using all defense capabilities, including nuclear weapons. This commitment holds critical importance for Japan, which faces a triple threat from China's rapid and opaque nuclear buildup, Russia's historical noncompliance with arms control, and the advancement of North Korea's (DPRK) nuclear and missile programs. The U.S. reiterated the necessity of multilateral strategic stability and arms control negotiations, while Japan emphasized the importance of engaging Russia and China. Both countries also reaffirmed their commitment to the complete denuclearization of North Korea.

The dialogue further discussed the importance of the U.S.-Japan Extended Deterrence Guidelines, strategic messaging of the alliance, crisis management communication, and enhancing coordination to support U.S. extended deterrence backed by Japan's defense capabilities. At the practical level, regular tabletop exercises are being conducted, indicating a deepening collaboration between the two countries in preparation for actual emergencies.

Since her historic election on October 21, 2025, Prime Minister Takai has shown remarkable movement in the fields of diplomacy and defense. In her summit with President Trump, she promised a "new golden era of the U.S.-Japan alliance," announced plans to accelerate defense-related spending to 2% of GDP two years ahead of schedule, and to expedite the revision of three key national security documents that had just been updated three years prior in 2022. These commitments are solidifying domestic support in the face of economic and military pressure from China.

However, as highlighted by analysis from the Center for Strategic and International Studies (CSIS), significant challenges remain for the alliance. One of the most pressing issues is the command and control architecture of the alliance. The U.S. Department of Defense continues its work to integrate U.S. Forces Japan (USFJ) into a joint command structure, aiming to become the true counterpart to Japan's newly established Joint Operations Command (JJOC). This initiative was announced during the Biden administration and confirmed by Secretary of Defense Lloyd Austin, but significant questions remain regarding the "new" USFJ's day-to-day authority and its relationship with the JJOC.

Equally important is the fact that a clear process for coordinating strike operations has yet to be developed as Japan begins to deploy long-range missile capabilities in 2026. Japan announced a significant investment in long-range strike capabilities, including the acquisition of Tomahawk land-attack cruise missiles, in its 2022 defense strategy, with plans to deploy these on destroyers starting next year. However, a specific framework for how to coordinate and operate these capabilities with the U.S. remains an unresolved issue that requires actively engaged political leadership.

The Trump administration's new national security strategy prioritizes the Western Hemisphere, avoids criticizing Russia's invasion of Ukraine, ignores North Korea, and adopts a particularly critical stance toward European allies. This has introduced considerable uncertainty regarding U.S. priorities on issues important to Tokyo. President Trump's visit to Japan at the end of October and Secretary Austin's two positive visits reaffirmed the commitment to the security alliance in Tokyo, but behind the scenes, the mechanisms of the alliance have significantly slowed down.

Since Trump's return, the two countries have not held a "2+2" meeting (involving the Secretaries of State and Defense and their Japanese counterparts), nor have they announced plans for future meetings. While practical-level meetings continue, the lack of regular high-level engagement as a forcing function, and more broadly, the absence of a robust alliance agenda, poses a risk of stagnation. Given the array of serious common challenges both countries face and the significant unfinished business, this timing is unfortunate.

Strengthening Japan's defense industrial base is also a critical focus. The 2022 defense strategy places significant emphasis on enhancing the long-neglected domestic defense industry, and Prime Minister Takai has indicated her intention to maintain this focus. The plan to develop Japan's first defense industrial strategy by the end of 2026 is understandable in light of Japan's threat environment, its relatively small defense industry, and the key lessons from the Ukraine war—that the ability to produce a large volume of defense equipment is essential for deterrence and resilience. Earlier this year, Australia selected Mitsubishi Heavy Industries as the builder for next-generation frigates, indicating that Japan's defense industry is gradually emerging as a global player.

However, the instinctive inclination toward domestic production also carries risks. Japan's industrial sector is already under pressure from demand due to a 60% increase in defense spending compared to three years ago. Moreover, in critical technology areas such as artificial intelligence and autonomy, cloud computing, and space-based surveillance and communication, Japan is falling behind in global competition. Inefficient resource allocation, such as exclusively favoring Japanese industry in these areas, risks leading to higher costs, lower capabilities, or both.

Financial sustainability is also a serious concern. With the highest debt-to-GDP ratio among advanced countries—approximately 240% of GDP—and many other costly domestic priorities competing for political leaders' attention, the financial and political constraints surrounding continued increases in defense spending are very real. Prime Minister Takai's two predecessors did not provide clear answers, and plans to raise taxes for this purpose have not been fully realized. On the contrary, in Japan's last two national elections, several parties emerged advocating for tax cuts to address inflation and other issues.

This Extended Deterrence Dialogue represents an important step in demonstrating the ongoing commitment and deepening of the U.S.-Japan alliance. However, for the alliance to truly realize its potential and effectively address the growing regional security challenges, there is an urgent need for revitalization of active dialogue at high levels, concrete progress on command and control and strike coordination, and a framework for sustainable defense investment. The U.S.-Japan alliance during the Trump-Takai era will serve as a critical litmus test in both its promises and challenges over the coming months.