On Tuesday morning, Prime Minister Anthony Albanese stood in front of the world's media, next to US President Joe Biden and the British Prime Minister Rishi Sunak.    They were announcing details of the AUKUS agreement which will see Australia acquire and build eight nuclear-powered submarines over the next three decades at a cost north of 350 billion dollars.   Today, foreign affairs and national security correspondent for The Sydney Morning Herald and The Age, Matthew Knott on what we now know about the AUKUS deal.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.