US-based Post journalist Owen Churchill goes beyond the "playing with fire" headlines to analyse what was discussed – and what was not – in the 2.5-hour phone call between Xi Jinping and Joe Biden, as well as the domestic pressures from Nancy Pelosi's potential visit to Taiwan. Post diplomacy expert Shi Jiangtao looks at political scientist Graham Allison's theory of the 'Thucydides Trap', its forecast of war between the US and China and its relevance to the current state of Sino-US relations.