LONDON (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.

Stock markets jumped in Asia ahead of US-China trade talks due to get under way in Britain today. Shares were up from Hong Kong to Tokyo following a call late last week between US president Donald Trump and Chinese leader Xi Jinping.

U.S.-China trade talks in London this week are expected to take up a series of fresh disputes that have buffeted relations, threatening a fragile truce over tariffs. Both sides agreed in Geneva last month to a 90-day suspension of most of the 100%-plus tariffs they had imposed on each other in an escalating trade war that had