A major Project Sea 3000 contract with Japan will deliver three upgraded Mogami frigates to Australia from 2029, with more to be built locally—boosting capability as the RAN modernizes.
Melbourne witnessed a landmark step for Australia’s naval future as Australia and Japan moved ahead with a deal to buy upgraded Mogami-class frigates for the Royal Australian Navy.
The agreement sits under Project Sea 3000. with defense ministers signing the contract aboard the Japanese vessel JS Kumano earlier this month.. For Australia. it arrives amid a pressing reality: its surface combatant fleet is set to shrink to its smallest size since World War II.. For Japan. the deal is also a milestone. described as its largest-ever defense export—an event that signals deeper strategic alignment and a major lift for shipbuilding at a time when maritime capabilities are becoming more tightly tied to national security.
The procurement is structured as a staged build.. Mitsubishi Heavy Industries will construct three frigates in Japan, with the first delivery targeted for December 2029.. After that. another eight upgraded Mogami ships will be built in Western Australia. turning the program into both a capability upgrade and an industrial project.. The overall cost is expected to reach up to A$20 billion over the coming decade—double the amount indicated just two years ago—reflecting the scale of the build and the push to field a more capable class of ship rather than simply replace aging hulls.
Misryoum notes that the heart of this announcement is not just the number of warships, but what they can do.. Australian officials argue that the navy is managing a transition—from one mix of platforms and technologies to another with significantly different performance.. Rear Admiral Stephen Hughes. head of Naval Capability. framed the decision around the idea that capability should be measured in capability. not only in headcount.. In his view. the Mogami frigates allow a leap forward in technology—across combat systems and even the way the Royal Australian Navy operates and crews more automated ships.
A key part of the program is how much of the ship’s design will remain “as built” to keep timelines realistic.. Misryoum understands the approach aims to limit the number of Australian-specific changes.. That restraint matters because custom modifications can delay delivery, force design rework, and increase integration risk.. The stated plan is to adopt a ship whose baseline systems are already compatible with Australian needs. reducing friction between procurement goals and engineering realities.
Operational impact is also central.. Australia currently fields ten surface combatants—three Hobart-class destroyers and seven Anzac-class frigates.. The upgraded Mogami will replace the Anzac-class ships. and the navy expects improvements not only in combat and sensors. but in availability as well.. The officials behind the program have highlighted an expectation of 300 days at sea each year. a metric that matters as much to readiness as it does to morale: ships that can deploy reliably are the ones that can be present when needed.
The frigates’ mission package is designed for modern maritime threats, combining air defense, anti-surface, and anti-submarine capabilities.. The systems mentioned include ESSM Block 2 surface-to-air missiles in a 32-cell Mk 41 vertical launch system. deck-mounted Naval Strike Missiles. MK 54 lightweight torpedoes. and SeaRAM.. They also integrate Japanese sensors and components such as the combat management system. sonar. and the UNICORN mast—building a coherent combat ecosystem rather than treating each system as an isolated upgrade.
Misryoum also flags the industrial layer as an important part of the story.. Subcontracts are already being awarded. including work for equipment such as sonars and UNICORN integrated masts through Japanese company NEC. and gas turbines via Rolls-Royce for MT30 systems.. That supply chain complexity is one reason the program has drawn attention for both its defense implications and its manufacturing reach.. It signals a coordinated approach across nations—one that goes beyond procurement paperwork and reaches into how parts. sensors. and propulsion are sourced. tested. and delivered.
Looking ahead. Australia and Japan are ultimately expected to operate a combined fleet of 35 Mogami frigates. turning a single contract into a long-term shared capability trajectory.. The strategic implication is that both navies are aligning around a platform designed for the realities of the Indo-Pacific: more contested maritime environments. faster decision cycles. and ships that can sustain operations rather than spend time in extended maintenance.. If the program stays on track. the Mogami class could serve as a defining marker of how Australia modernizes—prioritizing technological jump. operational availability. and a manageable pathway to large-scale fleet renewal.