Australia will build Mogami-class frigates that retain the core design of the Japanese versions, the Chief of the Australian Defence Force said Tuesday.
This procurement strategy is intended to ensure seamless interoperability between the Australian and Japanese navies. By utilizing a shared design, both nations can coordinate more effectively in joint operations, while allowing Australian firms to manage long-term maintenance and support.
The partnership was formalized in a contract signed on April 18, 2026 [3], in Melbourne. The total value of the contract is 10 billion Australian dollars, which is approximately 6.5 billion U.S. dollars [1]. This initial agreement includes the order of three frigates [2].
"The Australian Mogami ships will have the core DNA of the Japanese versions," the Chief of the Australian Defence Force said.
Australian Defence Minister Richard Marles said the deal represents a significant step in defense cooperation between the two countries. He said that the first three vessels will be constructed in Australia according to Japanese design standards.
Beyond the immediate construction of the ships, the agreement aims to boost the participation of Japan's defense industry. The Australian Defence Force chief said that keeping the core design unchanged allows for integration with allies, and supports local industry throughout the lifecycle of the ships.
The project focuses on the first three vessels, though the overall contract value suggests a broader program for the fleet [1, 2].
“The Australian Mogami ships will have the core DNA of the Japanese versions.”
The decision to adopt the 'core DNA' of the Mogami-class frigate signals a shift toward deeper military standardization between Australia and Japan. By sacrificing some design autonomy in favor of a proven Japanese blueprint, Australia prioritizes rapid interoperability and streamlined logistics over bespoke domestic specifications. This move strengthens the strategic alignment of both nations in the Indo-Pacific region.
