Mutual Defense Treaties and Defense Groupings in the Indo-Pacific Region

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ID: 317953
2026
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Abstract
Abstract This chapter provides an introductory overview of five enduring defense alliances established in the Indo-Pacific between 1951 and 1971, with the aim of assessing the scope of the legal obligations triggered in the case of an armed attack on an alliance partner. The alliances in question include the ANZUS between Australia, New Zealand, and the United States; the Five Powers Defence Arrangement (FPDA) between Australia, Malaysia, New Zealand, Singapore, and the United Kingdom; and three bilateral alliances between the United States and the Philippines, Japan, and the Republic of Korea, respectively. In furtherance of this aim, the chapter addresses controversies over the geographic scope of each alliance and (in particular in relation to the United States–Japan alliance), the threshold for triggering the right of individual or collective self-defense of alliance partners. It also examines challenges related to alliance durability and competing treaty obligations that may arise from the parallel security arrangements with partially overlapping partners. The chapter concludes by identifying the potential spillover effects of escalating maritime disputes between various alliance partners with the PRC—as well as with each other—on the United States as a major source of future concern.
Reference Key
openalex_W7165115316 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Erika de Wet
Journal Oxford University Press eBooks
Year 2026
DOI
10.1093/oso/9780197844540.003.0011
URL
https://doi.org/10.1093/oso/9780197844540.003.0011
Keywords Keywords not found

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