What does this research mean for the field?

Washington and Tokyo do not apply a uniform template to trilateral security cooperation, but instead use 'differentiated alliance management' to tailor institutional configurations to the specific domestic, capability, and diplomatic constraints of each partner. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To explain why three US-Japan-anchored trilateral security partnerships diverge across organization, process, capability, and network structures despite sharing a common security axis and strategic focus.

August 28, 2026Pacific Affairs

Differentiated Alliance Management: The Generative Logic of Institutional Divergence in “US-Japan+” Trilateral Security Cooperation

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Authors

XJXingchuan JiangHuazhong University of Science and Technology

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Implication

Comparative case analysis reveals institutional divergence across three US-Japan trilateral security frameworks, highlighting how partner constraints drive differentiated alliance management.

Key Points

To explain why three US-Japan-anchored trilateral security partnerships diverge across organization, process, capability, and network structures despite sharing a common security axis and strategic focus.
Developed an analytical framework of differentiated alliance management evaluating partner domestic-political, capability-structural, and diplomatic-risk constraints.
Conducted comparative process tracing across three parallel trilateral partnerships initiated or deepened since 2022: US-Japan-Australia, US-Japan-Republic of Korea, and US-Japan-Philippines.
Identified that Washington and Tokyo do not apply a uniform alliance template, instead calibrating institutional configurations to individual partner constraints.
Characterized three distinct institutional forms: deepening non-alliance high-level integration with Australia, non-binding political commitments with South Korea, and selective capability-building cooperation with the Philippines.

Cite This Study

Xingchuan Jiang (2026) studied this question.

synapsesocial.com/papers/6a91468ad15324a1df3aa321 https://doi.org/10.1080/0030851x.2026.2719544

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Implication

Comparative case analysis reveals institutional divergence across three US-Japan trilateral security frameworks, highlighting how partner constraints drive differentiated alliance management.

Differentiated Alliance Management: The Generative Logic of Institutional Divergence in “US-Japan+” Trilateral Security Cooperation

Discussion

Member takes

Implication

Key Points

Cite This Study

Differentiated Alliance Management: The Generative Logic of Institutional Divergence in “US-Japan+” Trilateral Security Cooperation

Discussion

Member takes

Implication

Key Points

Cite This Study

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