27 Jul 2025

Australia, UK sign 50 year AUKUS submarine defence partnership treaty

6:09 am on 27 July 2025
The USS Vermont, a Virginia-class SSN - nuclear powered submarine - in the Thames River, Connecticut, on 26 October, 2020.

Australia says it has signed a defence partnership deal with the UK to help Australia towards obtaining nuclear powered submarines. Shown, the USS Vermont, Virginia-class SSN - nuclear powered submarine (file photo). Photo: US Navy/ John Narewski

Australia's government says it has signed a treaty with Britain to bolster cooperation over the next 50 years on the AUKUS nuclear submarine partnership.

The AUKUS pact, agreed upon by Australia, Britain and the US in 2021, aims to provide Australia with nuclear-powered attack submarines from the next decade, to counter China's ambitions in the Indo-Pacific.

  • AUKUS details unveiled: Australian nuclear submarine programme to cost up to $394.5 billion
  • US President Donald Trump's administration announced a formal review of the pact this year.

    Australian Defence Minister Richard Marles said in a statement that the bilateral treaty was signed with Britain's Defence Secretary John Healey on Saturday after a meeting in the city of Geelong, in Victoria state.

    "The Geelong Treaty will enable comprehensive cooperation on the design, build, operation, sustainment, and disposal of our SSN-AUKUS submarines," the statement said.

    The treaty was a "commitment for the next 50 years of UK-Australian bilateral defence cooperation under AUKUS Pillar I", it said, adding that it built on the "strong foundation" of trilateral AUKUS cooperation.

  • NZ joining AUKUS would make geopolitical waves - expert
  • Britain's ministry of defence said this week that the bilateral treaty would underpin the two allies' submarine programmes and was expected to be worth up to £20 billion (NZ$44b) for Britain in exports over the next 25 years.

    AUKUS is Australia's biggest-ever defence project, with Canberra committing to spend AU$368 billion over three decades to the programme, which includes billions of dollars of investment in the US production base.

    Australia, which this month paid AU$800 million to the US in the second instalment under AUKUS, has maintained it is confident the pact will proceed.

    The defence and foreign ministers of Australia and Britain held talks on Friday in Sydney on boosting cooperation, coinciding with Australia's largest war games.

    As many as 40,000 troops from 19 countries are taking part in the Talisman Sabre exercises held from 13 July to 4 August, which Australia's military has said are a rehearsal for joint warfare to maintain Indo-Pacific stability.

  • Australia will not commit troops in advance to any conflict, minister says
  • Britain has significantly increased its participation in the exercise co-hosted by Australia and the United States, with aircraft carrier HMS Prince of Wales taking part this year.

    - Reuters

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