When the G20 first met in 2008, it was in the heat of a global economic meltdown as world leaders worked together to help stabilise the plunging financial markets. But for the G20’s 10th birthday summit, the mood around the table has changed. Some of the biggest countries including the US, China, Brazil, Russia, Saudi Arabia and Turkey are run by populist autocrats and authoritarians.

Joining Anushka Asthana is the Guardian’s world affairs editor, Julian Borger, who is in Buenos Aires for the summit. He says the focus will be on a series of bilateral relationships, particularly between Donald Trump and China’s (XDD), Russia’s Vladimir Putin and Saudi Arabia’s Crown Prince Mohammed bin Salman. We hear from the Guardian’s foreign correspondents Tania Branigan, Andrew Roth and Martin Chulov.