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Marles said he and Healey will sign a 50-year treaty Saturday that will underpin bilateral cooperation on building an Australian fleet of submarines powered by U.S. nuclear technology.

“It is as significant a treaty as has been signed between our two countries since federation,� Marles said, referring to the unification of several British colonies to form the Australian government in 1901.

The three-way alliance was announced in 2021 to contend with growing Chinese military might in the Asia-Pacific region. It would deliver Australia at least eight submarines including three to five second-hand U.S. Virginia-class submarines. Britain and Australia would cooperate to build their own SSN-AUKUS submarines.

US reviewing AUKUS trilateral submarine deal

U.S. Defense Secretary is reviewing the pact, known by the acronym , that was entered into by U.S. President administration. There are concerns that the U.S. won’t provide Australia with its first Virginia-class submarine by the early 2030s as planned because U.S. submarine-building was behind schedule.

Marles and Healey declined to speculate on whether Britain and Australia would continue with jointly building submarines if the U.S. pulled out when questioned at a press conference.

“Australia and the U.K. welcome the review because we see this as a chance for a new administration to renew their commitment to AUKUS. And that’s what we expect,� Healey said.

“Any sort of hypotheticals that you suggest simply aren’t part of the picture,� Healey added, referring to the prospect of Britain and Australia proceeding without the U.S.

The Australian government confirmed this week it had paid the U.S. a second $500 million installment on the AUKUS deal. The first $500 million was paid in February.

The submarines are expected cost Australia up to .

The meeting comes as 3,000 British military personnel take part in the largest military exercise ever conducted in Australia.

British aircraft carrier joins Australian war games

More than 35,000 military personnel from 19 nations are taking part in , which began in 2005 as a biennial joint exercise between the U.S. and Australia.

Marles and Healey will inspect the British aircraft at the northern port of Darwin on Sunday. The carrier is in Australia to take part in the war games.

Lammy said the carrier’s arrival in Darwin was meant to send a clear signal to the world.

“With our carrier strike group docking in Darwin, I think we’re sending a clear signal, a signal of the U.K.’s commitment to this region of the world. Our determination to keep the Indo-Pacific free and open, and that we stand together,� he said.