The UK, US and Australia have announced a special security pact to share advanced defence technologies, in an effort to counter China.
The partnership will enable Australia to build nuclear-powered submarines for the first time.
The pact, to be known as Aukus, will also cover artificial intelligence, quantum technologies and cyber.
The three countries are worried about China's growing power and military presence in the Indo-Pacific.
As a result of the pact, Australia has scrapped a deal to build French-designed submarines.
France won a A$50bn (€31bn; £27bn) contract to build 12 submarines for the Australian Navy in 2016. The deal was Australia's largest-ever defence contract.
However, the project was hit with delays largely because of Canberra's requirement that many components be sourced locally.
On Wednesday, US President Joe Biden, UK Prime Minister Boris Johnson and his Australian counterpart Scott Morrison issued a joint statement on the launch of the new security partnership, labelled Aukus.
"As the first initiative under Aukus... we commit to a shared ambition to support Australia in acquiring nuclear-powered submarines for the Royal Australian Navy," the statement said.
"This capability will promote stability in the Indo-Pacific and will be deployed in support of our shared values and interests," it said.
The leaders said the aim was to "bring an Australian capability into service at the earliest achievable date", adding: "Australia remains committed to fulfilling all of its obligations as a non-nuclear weapons state."
It went on to say that the defence pact would also focus on cyber capabilities, artificial intelligence and "additional undersea capabilities".
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