Nepal, June 9 -- China's exports to the United States fell 35% in May from a year earlier, new customs data show, adding to pressure on the world's second largest economy as a new round of trade talks with Washington was due to start later Monday in London.

China's total exports rose 4.8% last month, slowing from an 8.1% year-on-year increase in April. Imports declined 3.4% year-on-year, leaving a trade surplus of $103.2 billion.

China exported $28.8 billion to the United States in May, compared with $44 billion a year earlier. Its imports from the U.S. fell to $10.8 billion, the report said.

Still, exports to Southeast Asia and the European Union remained robust, growing 14.8% and 12%, year-on-year. Exports to Thailand, Vietnam and In...