Grave warnings on China from the FBI and MI5 on the eve of the G20 conference in Bali: how will this affect the agenda? SCMP correspondent Mark Magnier and Beijing-based political economy editor Wendy Wu analyse the pressures on Joe Biden to reduce tariffs to lessen inflation while not looking “weak” on China and what Beijing will do in response; veteran trade lawyer Ben Kostrzewa analyses how four years of tariffs and trade war has changed trade between the US and China.