Trump's hotly anticipated trip to China - the first by a U.S. president to America's main strategic rival since his last visit there in 2017 - has taken on added significance.

The first US presidential visit to China in almost 10 years will test a fragile tariff truce.

The summit between US President Donald Trump and his Chinese counterpart Xi Jinping that begins on Wednesday in Beijing will unfold around an agenda concentrated on five main…