One year after their last in-person talks, Xi Jinping and Joe Biden will come face to face once again on Wednesday in San Francisco, in an encounter that will dominate events at the Apec summit as the Chinese and US presidents seek to stabilise relations in an increasingly fraught geopolitical climate. The meeting, which could last several hours, is the culmination of months of lower level dialogues which took place over the summer, with Washington sending more delegates to China than Beijing did to the US. The fact of China’s leader visiting the US for the first time in six...