Ambassador says U.S. unconvinced China willing to make fast progress on trade

FILE PHOTO: U.S. Ambassador to China Terry Branstad speaks at an event to celebrate the re-introduction of American beef imports to China in Beijing, China June 30, 2017. REUTERS/Mark Schiefelbein/Pool

BEIJING (Reuters) - The United States is not convinced China is willing to make sufficient progress on trade, the U.S. ambassador to China said on Friday, as the world's two biggest economies remain locked in spiralling disputes.

U.S. President Donald Trump is set to impose tariffs on billions of dollars worth of Chinese imports on July 6 to punish China for what the United States says are intellectual property abuses.