Partnering with Japan for technology sharing as part of AUKUS is a "natural evolution" of the trilateral security pact, the prime minister says.
However, Anthony Albanese indicated working alongside Japan as part of AUKUS does not mean the alliance of Australia, the UK and US would formally expand to include a fourth country.
In a joint statement, the three AUKUS partners said they were considering working with Japan as part of advanced capability projects.
