Will a chilly meeting in Anchorage set the tone for US-Chinese relations? | Emma Graham-Harrison

Openings of summits are often dull affairs, but the tense exchanges in Alaska hint at turbulent times ahead

In a protracted, unplanned public spat in Anchorage late on Thursday, China and America's top diplomats traded barbs for over an hour in front of astonished journalists.

The openings to diplomatic summits are usually dull and carefully choreographed, a showcase for the world's cameras before the doors close and the real talks begin.