A new round of trade negotiations between the United States and China has started in London, with both sides trying to preserve a fragile truce brokered last month.

Wall Street's main indexes were mixed on Monday as investors watched a fresh round of U.S.-China negotiations aimed at mending a trade rift that has rattled financial markets for much of the year. Top officials from both countries have kicked off discussions at London's Lancaster House,

Officials from both sides are set to talk on Monday in London, aiming to resolve differences over tariffs and supply chains that have endangered a fragile truce between the countries.