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.

LONDON, June 9 (Reuters) - Top U.S. and Chinese officials will sit down in London on Monday for talks aimed at defusing the high-stakes trade dispute between the two superpowers that has widened in recent weeks beyond tit-for-tat tariffs to export controls over goods and components critical to global supply chains.