The stark contrast in tone underscored just how far apart the leaders remain on the war in Iran, trade disputes and Washington's relationship with Taiwan.

Taiwan, tariffs and the strait of Hormuz are on the meeting’s agenda for Beijing – but will the US president be forced to ask for help in ending his war with Iran?

China experts expect Trump and Xi may announce trade deals or other agreements, such as a Chinese purchase of U.S. agricultural products or Boeing aircraft.