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  • Brittany Bardsley-Marcial Graduate Student at Missouri State University
  • Jada Fraser Graduate Student at Georgetown University’s School of Foreign Service
  • Shinichi Hirao Captain of the Japan Ground Self Defense Force (JGSDF)
  • Yu Inagaki Research Assistant at the Sasakawa Peace Foundation (SPF)
  • Shusuke Ioku Ph.D. Student at the Department of Political Science, the University of Rochester
  • Casimira "Cassie" Rodriguez Japan Desk at the U.S. Department of State
  • Rena Sasaki Graduate Student at Georgetown University’s School of Foreign Service
  • Ayae Yoshimoto Consulate-General of Japan in San Francisco
  • Christopher Lamont Assistant Dean of E-Track Programs and Associate Professor of International Relations at Tokyo International University (TIU)
  • Jeffrey Ordaniel Director for Maritime Security (non-resident) at the Pacific Forum

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Issues & Insights Vol. 22, SR9 – An Alliance Renewed? Future-proofing U.S.-Japan Security Relations

About this Volume

Authors of this volume participated in the inaugural U.S.-Japan Next-Generation Leaders Initiative, sponsored by the U.S. Department of State, through the U.S. Embassy Tokyo. With backgrounds from academia, government, military and industry, the cohort brings rich insights on the past, present, and future of the U.S.-Japan bilateral security relations.

The statements made and views expressed are solely the responsibility of the authors and do not necessarily reflect the views of their respective organizations and affiliations. Pacific Forum’s publications do not necessarily reflect the positions of its staff, donors and sponsors.

Click here to download the full volume.


Table of Contents

Introduction: An Alliance Renewed? Future-proofing U.S.-Japan Security Relations | Christopher Lamont & Jeffrey Ordaniel 
Chapter 1: The Cornerstone and the Linchpin: Reconstituting U.S.-ROK- Japan Trilateral Security CooperationJada Fraser
Chapter 2: The Evolution of U.S.-Led Alliance Systems: A Minilateralist Approach in the Indo-Pacific | Cassie Rodriguez
Chapter 3: Japan-U.S. Alliance in Harmony? Perspectives from Power, Interests, and Values | Yu Inagaki
Chapter 4: Extended Gray Zone Deterrence in the South China Sea | Shusuke Ioku
Chapter 5: Enhancing Taiwan’s Resistance: Military and Diplomatic Roles of the U.S.-Japan Security Alliance | Ayae Yoshimoto
Chapter 6: Why Defending Taiwan is Crucial for the Future of the U.S.- Japan Alliance? | Rena Sasaki
Chapter 7:
Applying NATO’s Practices to the Japan-U.S. Alliance | Shinichi Hirao
Chapter 8: Expanding the Eyes: Japan and the Five Eyes Alliance | Brittany Bardsley-Marcial


This collection of papers begins with contributions that explore how the alliance will continue to evolve in the face of emergent challenges. Indeed, the first paper by Jada Fraser places an emphasis on rethinking how the United States can more effectively harness its alliance relationships in East Asia to advance shared interests and counter emerging threats. Fraser identifies the “advantages of organizing the U.S.-Japan-ROK trilateral as a form of flexible multilateralism based on overlapping frameworks of cooperation rather than a formally binding agreement.”

The second contribution to this volume, by Cassie Rodriguez, examines how U.S. relationships in East Asia are shifting from a more traditional network of ‘hub-and-spokes’ security arrangements to a ‘minilateralist’ approach that favors informal alignments of countries that are more targeted and issue-specific. For Rodriguez, the U.S.-Japan alliance could become a model for minilaterlism and a driver for the establishment of robust, yet flexible small groupings of states working closely together on shared challenges. An example of this is the Quad.

The next two papers offer insights from international relations theory. Yu Inagaki draws on Kosaka Masataka’s power, interests, and norms framework to offer recommendations for both the United States and Japan to bring both countries into closer alignment. Meanwhile, Shusuke Ioku presents quantitative data analyses of territorial aggression and formal modeling of gray zone conflicts to argue that the key to deterring gray zone coercion is helping sustain the presence of Southeast Asian claimants through capacity building related to reinforcement of presence, constant naval and air patrols, and other measures that would allow them to withstand low-level aggression without backing down. Ioku recommends that Japan and the United States channel limited recourses accordingly and not be content with symbolic joint exercises and rhetorical support for rules-based resolution of disputes.

The next four papers delve deeper into issue-specific areas and contingencies that present challenges and opportunities for the U.S.-Japan alliance going forward. First, Ayae Yoshimoto provides Japan’s perspective on heightened tensions over Taiwan. Offering recommendations that aim to bolster Taiwan’s own position and image in the international community alongside more practical observations relating to a Taiwan contingency, Yoshimoto underlines the critical importance of Taiwan for Japan’s national security. Next, Rena Sasaki provides a more granular analysis of the legislative, regulatory, and political constraints that a more limited Taiwan contingency scenario would pose for Tokyo. Both Yoshimoto and Sasaki underline how Taiwan contingencies demonstrate the urgent need for Tokyo and Washington to bolster crisis response mechanisms.

Shinichi Hirao then turns to examine how NATO standards can enhance the U.S.-Japan alliance. Benchmarking against NATO’s core tasks of Deterrence and Defense, Crisis Management, and Cooperative Security, as outlined in the 2022 Strategic Concept, Hirao draws lessons for the U.S.-Japan security relationship. Hirao also concludes by offering specific recommendations to Tokyo for defense procurement. The final paper of this collection, by Brittany Bradley-Marcial, explores the question of bringing Japan into the Five Eyes community, analyzing both the rationale and the obstacles to membership, as well as potential paths forward that could bring Japan into a closer intelligence sharing relationship with the Five Eyes.

In sum, each contribution to this volume contains new insights into the U.S.-Japan alliance from the next generation of scholars, decision-makers, or military leaders. To be sure, this collection of papers attests to one of the critical factors that explains the longevity of the U.S.-Japan alliance: the alliance’s continuous ability to remake itself in the face of new and emerging challenges.


About the Authors

Brittany Bardsley-Marcial is a graduate student at Missouri State University pursuing a master’s degree in Cybersecurity. Brittany interned with the Daniel K. Inouye Asia-Pacific Center for Security Studies (DKI- APCSS), where she had many opportunities to work with faculty members on projects related to Indo-Pacific security issues. She helped developed a strategic game scenario at APCSS, which was incorporated into one of the courses run in February 2022. Brittany received her BA in Political Science, with a Minor in Japanese from Hawaii Pacific University. To broaden her understanding of the Japanese language and culture, she studied abroad at Nagoya University of Foreign Studies, for one year.

Jada Fraser is an M.A. Student in Asian Studies at Georgetown University’s School of Foreign Service. Previously, she was a Policy Research Fellow with the Edwin O. Reischauer Center for East Asian Studies at Johns Hopkins SAIS. Her research for the Center primarily focused on prevailing geopolitical trends in the U.S.-Japan-China strategic triangle. Prior to joining SAIS, Jada worked as a Research Assistant with the Japan Chair at the Center for Strategic and International Studies. She focused on issues in the U.S.-Japan Alliance and U.S. and allies’ Indo-Pacific strategy. Her work has been published on the CSIS website. Jada graduated with High Honors and Departmental Special Honors from the University of Texas at Austin where she completed her B.A. in International Relations and Global Studies and was awarded a certificate in Security Studies from the Clements Center for National Security. Her current research interests include U.S. alliance strategy in the Indo-Pacific, Japan-South Korea relations, and strategic competition with China.

Shinichi Hirao is a Captain of the Japan Ground Self Defense Force (JGSDF). He received his BA in law from the University of Tokyo in 2014. After graduation, he joined the JGSDF and was commissioned as a Second Lieutenant in 2016. He served as a platoon leader and joined a disaster relief operation in Kumamoto in 2016. He was then selected to study in the United States, where he earned his Master of Public Policy degree from the Frank Batten School of Leadership and Public Policy, the University of Virginia, in December 2020. Upon graduation, he returned to the JGSDF, and was appointed as Operations and Training Officer of an infantry company under the 34th Infantry Regiment, Gotemba, Shizuoka.

Yu Inagaki is a research assistant at the Sasakawa Peace Foundation (SPF) working under the Japan-U.S. Program. He is also an active member of the Young Leaders Program at the Pacific Forum. Yu received his MA from the School of Advanced International Studies, Johns Hopkins University, where he majored in international relations and strategic studies. His research interests include theories of International Relations, grand strategy, international order, and security in the Indo-Pacific. Among his latest work is a paper comparing the Indo-Pacific Strategy of Japan and the United States. Previously, he interned at the Hudson Institute and the Center for Strategic and International Studies (CSIS), both in Washington, DC, and also at the Asia Pacific Initiative in Tokyo. At SPF, he helps run several study groups on Japan-U.S. relations and assists in related research.

Shusuke Ioku is a Ph.D. student at the Department of Political Science, the University of Rochester where he studies formal Political Theory and International Relations. His current research projects address inefficiency of coercive diplomacy and subnational political consequences of Chinese economic statecraft. He has a particular interest in gray-zone maritime disputes in the East and South China Seas since he did an internship at the Asia Maritime Transparency Initiative under the Center for Strategic and International Studies. Before coming to the United States, he received an M.A. in Political Science from Waseda University and B.A. in Philosophy from the University of Tokyo.

Casimira “Cassie” Rodriguez of San Bernardino, California is a graduate student and a Scholars in the Nation’s Service Initiative (SINSI) fellow at Princeton’s School of Public and International Affairs. She graduated from Princeton in 2019 with an A.B. in Politics and certificates in East Asian Studies and the History and Practice of Diplomacy, completing a senior thesis on Japanese security policy. Following graduation, she studied advanced Japanese in Yokohama at the Inter-University Center for Japanese Language Studies as a Blakemore Freeman fellow and presented her research on alliance politics. She has interned at both the Center for Strategic and International Studies (CSIS) and the Sasakawa Peace Foundation in Washington, D.C., taking part in research/publications on U.S.-Japan issues and helping facilitate U.S.-Japan exchange events. Her areas of research include Japanese foreign policy, the international relations of East Asia, and security politics. As part of her SINSI fellowship, she will complete two years of federal government service before graduating from her MPA program. She is currently working on the Japan Desk at the U.S. Department of State.

Rena Sasaki is a graduate student at the School of Foreign Service, Georgetown University, pursuing a Master’s degree in Foreign Service. Rena was a senior associate at Strategy& (formerly Booz & Company), global management consulting firm and has engaged in defense and security projects with the Japanese Ministry of Defense and the defense industry for more than five years. She has deep knowledge of defense equipment acquisition, domestic supply chains for defense manufactures, and game-changing technology. She is interested in regional security issues in the Indo-Pacific and has engaged in several research projects on China’s military and economic security. She was selected as a delegate for the U.S-.China Dialogue which is a student-to-student dialogue between Georgetown University and Peking University. She graduated from Waseda University with a Bachelor’s in Engineering and Master’s in Engineering, and majored in Statistics. Rena is an intermediate-level Mandarin speaker.

Ayae Yoshimoto is currently working at the Consulate-General of Japan in San Francisco. Previously, she was a junior visiting fellow at the Japan Institute of International Affairs (JIIA). She received her B.A. in Communication from Doshisha University in Japan and then her M.A. in International Relations from the National Chengchi University in Taiwan. Her research interests include Japan’s foreign and security policy, Sino-Japan relations, cross-strait relations, and U.S.-Japan Alliance. While in graduate school in Taiwan, she did a research internship on Taiwan-Japan relations at Taiwan NextGen Foundation. In addition to her mother tongue, Japanese, she is fluent in English and Chinese.

About the Editors

Christopher Lamont is Assistant Dean of E-Track Programs and Associate Professor of International Relations. Previously, he held a tenured position at the University of Groningen, and was a postdoctoral fellow at the University of Ulster. He was also previously a Fulbright scholar at the University of Zagreb in Croatia. He holds a PhD from the University of Glasgow and has published widely on human rights and transitional justice. His recent publications have appeared in the Journal of Democracy, the International Journal of Human Rights, Global Policy, Journal of Intervention and Statebuilding, and Human Rights Review. He also co-edited, New Crifical Spaces in Transitional Justice (with Arnaud Kurze, Indiana University Press, 2019) and is the author of two research methods textbooks, Research Methods in International Relations (Sage 2015, second edition 2021), and Research Methods in Politics and International Relations (with Mieczyslaw Boduszyński, Sage 2020). In addition to his scholarly work, his writings have also appeared in Foreign Policy, Foreign Affairs, and the Washington Post’s Monkey Cage.

Jeffrey Ordaniel is Director for Maritime Security (non-resident) at the Pacific Forum. Concurrently, he is also Associate Professor of International Security Studies at Tokyo International University (TIU) in Japan. He holds a Ph.D. in International Relations and specializes in the study of offshore territorial and maritime entitlement disputes in Asia. His teaching and research revolve around maritime security and ocean governance, ASEAN regionalism, and broadly, U.S. alliances and engagements in the Indo-Pacific. From 2016 to 2019, he was based in Honolulu and was the holder of the endowed Admiral Joe Vasey Fellowship at the Pacific Forum. Since 2019, Dr. Ordaniel has been convening several track II dialogues on U.S. security relations in the Indo-Pacific, and workshops on maritime security issues. His current research on maritime security in Asia is funded by the Japan Society for the Promotion of Science (JSPS). With JSPS funding, he also serves as Project Researcher with RCAST- Open Lab for Emerging Strategies, The University of Tokyo.


Photo: President Joe Biden and Japanese Prime Minister Kishida Fumio participate in an arrival ceremony, Monday, May 23, 2022, at Akasaka Palace in Tokyo. Source: Official White House Photo by Adam Schultz/Public Domain