Japan and Australia Formalise Deepening Defence Ties Amid Growing Indo-Pacific Threats

In December 2025, Defence Ministers Richard Marles and Shinjiro Koizumi unveiled a Framework for Strategic Defense Coordination that elevates the Japan-Australia "Special Strategic Partnership" to an informal alliance, focusing on deterrence and joint capability development. The agreement builds on a series of earlier pacts, such as the 2010 acquisition and cross-servicing deal and the 2022 reciprocal access agreement, and follows Australia’s 2025 purchase of upgraded Mogami-class frigates built jointly by Mitsubishi Heavy Industries in Japan and Australia’s Henderson shipyard.

A May 2026 visit by Prime Minister Sanae Takaichi produced a Leaders' Statement on Enhanced Defence and Security Cooperation and a joint declaration on economic security, covering critical minerals, energy and emerging technologies. Both governments argue the partnership reflects a strategic alignment against China’s assertiveness while complementing U.S. objectives in the region. Future steps call for scenario-based planning, possible Five Eyes intelligence sharing and deeper private-sector involvement in defence and technology sectors.