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.

By Purvi Agarwal (Reuters) -European shares were subdued on Monday, after rounding off the previous week with gains, as markets were cautious ahead of another round of Sino-U.S. trade talks later in the day.

Chinese exports of rare earths, a group of 17 minerals at the center of a trade dispute with Washington, rose 23% in May from the previous month, according to customs data on Monday.