AUKUS at Five Years: Nuclear Submarine Pact Reshapes Indo-Pacific Security

September 14, 2026 at 05:15 PM1 min

This digest was compiled by AI from multiple sources — links to the originals are below.

Five years after Australia scrapped a $90-billion French submarine deal, AUKUS has become a cornerstone of Indo-Pacific security. The trilateral pact with the U.S. and U.K. aims to deliver nuclear-powered submarines to counter China's naval expansion. The partnership has survived a U.S. presidential transition, unlike other Biden-era initiatives.

Key Facts

On September 15, 2021, Australia cancelled a $90-billion program for French-designed conventional submarines.
Australia instead formed AUKUS, a trilateral security partnership with the U.S. and U.K., to acquire nuclear-powered but conventionally armed submarines.
China's naval build-up and expansion into the Pacific, including near Australian waters, drove Australia's decision.
AUKUS has survived the second Trump presidency, while many other initiatives of the previous administration were dismantled.

Origins of the Pact

On September 15, 2021, Australia abandoned a $90-billion program to build French-designed conventional diesel-electric submarines. Instead, Australia embarked on a new trilateral security partnership with the U.S. and the U.K. to produce nuclear-powered, but conventionally armed, submarines. The decision came after five years of work on the French project, which Canberra deemed insufficient for its strategic needs.

Strategic Drivers

Australia's government concluded it needed the extra stealth and stamina that nuclear-fueled submarines provide. China is building up its military, especially its navy, at an astonishing speed and expanding its reach into the Pacific, right up to Australia's own waters. Australia decided it needed to respond with its own military build-up.

Survival Under Trump

Over the last five years, as AUKUS has taken shape, the dynamics behind regional security have continued to evolve. With the second coming of Donald Trump to the U.S. presidency, many of his predecessor's initiatives have been dismantled. But AUKUS has not been dismantled.