This first phase of the plan is already under way with Virginia, a nuclear-powered cruise missile attack submarine, currently visiting Perth, Australia, officials say.
The leaders of the United States, Australia and Britain revealed details of a plan to offer Australia nuclear-powered attack submarines.
In a joint statement on Monday, US President Joe Biden, Australian Prime Minister Anthony Albanese and British Prime Minister Rishi Sunak endorsed plans for the AUKUS project, first announced in 2021, at the US naval base in San Diego, California, principal home port of the US Pacific Fleet.
Under the deal, the United States intends to sell Australia three US Virginia class nuclear-powered submarines in the early 2030s, with an option to buy two more if needed, the joint statement said.
The statement from the leaders said the multi-stage project would culminate with British and Australian production and operation of a new class of submarine - SSN-AUKUS - a "trilaterally developed" vessel based on Britain's next-generation design that would be built in Britain and Australia and include "cutting edge" US technologies.
"The first UK submarines built to this design will be delivered in the late 2030s ... and the first Australian submarines will follow in the early 2040s," a British statement said.
The vessels will be built by BAE Systems and Rolls-Royce, it said.
The agreement will also see US and British submarines deployed in Western Australia to help train Australian crews and bolster deterrence, the senior US official said.
The joint statement said the United States and Britain would begin these rotational deployments as soon as 2027 and a senior US official said this would increase to four US submarines and one British in a few years.
This first phase of the plan is already under way with Virginia, a nuclear-powered cruise missile attack submarine, currently visiting Perth, Australia, officials said.
READ MORE: Biden, Sunak, Albanese expected to announce landmark nuclear submarine deal
Nuclear proliferation
AUKUS will be the first time Washington has shared nuclear-propulsion technology since it did so with Britain in the 1950s.
China has condemned AUKUS as an illegal act of nuclear proliferation.
In launching the partnership Australia also upset France by abruptly cancelling a deal to buy French conventional submarines.
Briefing a small group of reporters on Friday, US National Security Advisor Jake Sullivan dismissed China's concerns and pointed to Beijing's own military buildup, including nuclear-powered submarines.
"We have communicated with them about AUKUS and sought more information from them about their intentions," he said.
Big questions remain about the plan, not least over strict US curbs on the extensive technology sharing needed for the project and about how long it will take to deliver the submarines, even as the perceived threat posed by China mounts.
In a reflection of stretched US production capacity, the senior US official told Reuters it was "very likely" one or two of the Virginia-class submarines sold to Australia would be vessels that had been in US service, something that would require congressional approval.
Australia had agreed to contribute funds to boost US and British submarine production and maintenance capacity, the official said.
He said Washington was looking at a "double-digit billion" investment in its submarine industrial base on top of $4.6 billion already committed for 2023-29 and that the Australian contribution would be less than 15 percent of the total.
One senior US official said AUKUS reflected mounting threats in the Indo-Pacific, not just from China towards self-ruled Taiwan and in the contested South China Sea, but also from Russia, which has conducted joint exercises with China, and North Korea as well.
READ MORE: US and China prepare to tackle dangerous scenarios over the Taiwan issue
New jobs
Albanese said on Saturday that South Australia and Western Australia would be big beneficiaries of AUKUS. "This is about jobs, including jobs in manufacturing," he said.
Britain, which left the European Union in 2020, says AUKUS will help boost its economy's low growth rate.
Sunak said AUKUS was "binding ties to our closest allies and delivering security, new technology and economic advantage at home."
Australia's Defense Minister Richard Marles said last week the submarines would ensure peace and stability across the Indo-Pacific, Southeast Asia and the Indian Ocean.
"It is difficult to overstate the step that as a nation we are about to take," he said.
Political analysts said that given China's growing power and its threats to reunify with Taiwan by force if necessary, it was also vital to advance the second stage of AUKUS, which involves hypersonic missiles and other weaponry that can be deployed more quickly.
US officials said Monday's announcements will not cover this second stage.
"We'd like to leave that for another day," the senior administration official said.
British and Australian officials said this month work was still needed to break down bureaucratic barriers to technology sharing.
READ MORE: Australia to spend $10B on base for nuclear-powered submarines
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