Australia has struck its largest defence export deal under a $2.5 billion agreement to provide Canada with world-leading radar technology, as US allies look to broaden their security relationships.
The landmark pact was signed in Canberra on Monday by Defence Minister Richard Marles and Canada's Secretary of State for Defence Procurement Stephen Fuhr.
"Today's agreement really is a historic moment for Australia's defence industry, but it is also a historic moment in the bilateral relationship between Australia and Canada," Mr Marles said.
Canada will use Australia's Jindalee Operational Radar Network, known as JORN, to surveil vast swathes of the Arctic.
The over-the-horizon system has been in service for 40 years, with the system able to detect aircraft and ships up to 3000km from the northern Australian coast.