While Donald Trump hailed the outcome of trade talks in London, Xi Jinping walked away with an understated strategic gain: a negotiating process that buys China time and helps defuse the threat of more harmful tariffs and technology curbs.

High-level delegations from the United States and China are meeting in London to try and shore up a fragile truce in a trade dispute that has roiled the global economy.

"The two sides have, in principle, reached a framework for implementing the consensus reached by the two heads of state during the phone call on June 5th and the consensus reached at the Geneva meeting," China's Vice Commerce Minister Li Chenggang said.