Australia and Japan have signed a landmark defence contract to supply three Japanese‑built Mogami‑class frigates. The agreement was announced on April 18, 2026, by officials from both governments and marks a significant step in bilateral security cooperation.
The deal strengthens the Royal Australian Navy’s surface‑warfare capability and deepens the defence partnership between the two nations. By adding advanced frigates, Australia aims to improve its ability to operate in the Indo‑Pacific region, while Japan secures a strategic foothold with a trusted ally.
The contract is worth AUD 10 billion [1] and roughly U.S. $7 billion [2]. It covers the construction of three vessels in the first phase of a broader program that envisions up to eleven frigates for the Royal Australian Navy [3]. The ships will feature integrated combat systems, enhanced sensor suites, and greater endurance for long‑range missions.
Mitsubishi Heavy Industries will build the ships, reinforcing Japan’s role in regional maritime security [3]. The shipbuilder’s experience with advanced warship design is expected to accelerate delivery timelines and ensure the frigates meet Australian operational requirements.
The agreement reflects a shared commitment to a free and open Indo‑Pacific, signalling to regional actors that Australia and Japan are prepared to collaborate on defence procurement and joint training. Both governments have said the partnership will continue as additional vessels are ordered under the long‑term plan.
“Australia and Japan have signed a landmark defence contract to supply three Japanese‑built Mogami‑class frigates.”
What this means: The deal signals a deepening of Australia‑Japan defence cooperation and positions both countries to jointly counter emerging security challenges in the Indo‑Pacific, while also supporting Japan’s defence‑industry export agenda.
