Relations between the U.S. and China appear to be worsening amid a spat over the origins and handling of the coronavirus pandemic. President Trump has already raised the prospect of increased tariffs which would breach the phase 1 trade deal. At the same time though China’s imports from the U.S. have been in decline, dropping 23.5% year over year in March in total, which may breach the purchase commitments made in the deal. There was a 16.2% year over year slide in U.S. exports of the 548 products covered by the pact in March versus 2019 as well as a 14.4% slide versus 2017, the...