Australia and Japan have formalised a landmark A$10 billion ($7 billion) defence agreement to supply advanced warships to the Royal Australian Navy, marking Japan’s most significant military export since lifting its ban in 2014.

Defence Minister Richard Marles and Japan’s Defence Minister Shinjiro Koizumi signed a memorandum in Melbourne confirming both governments’ commitment to delivering the programme. The agreement reflects deepening Australia–Japan security cooperation amid shifting Indo-Pacific dynamics.

The contract forms part of Japan’s broader effort to expand defence partnerships beyond its alliance with the United States, as regional maritime security concerns grow.

Key developments:

  • Mitsubishi Heavy Industries will build three upgraded Mogami-class frigates in Japan from 2029
  • A further eight vessels will be constructed in Australia at the Henderson shipyard, Western Australia
  • The frigates will support anti-submarine warfare, surface strike, and air defence operations
  • Deployment will focus on securing key trade routes across the Indian and Pacific Oceans

ℹ️ Reuters

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Australia’s Deputy Prime Minister and Minister for Defence Richard Marles shakes hands with Japan’s Defence Minister Shinjiro Koizumi at the start of their talks at the Defense Ministry in Tokyo, Japan, April 18, 2026. REUTERS/Issei Kato/File Photo
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