Japan’s international trade activity dropped 10.4% year over year in August after a 1.4% slip in July. That’s included an 8.2% slide in global exports and weakens the Japanese government’s leverage just as the closure of a restricted trade deal between the U.S. and Japan is due to be signed by Prime Minister Abe and President Trump on Sept. 25. Exports to the U.S. fell 4.4%, including a 13.0% drop in shipments of autos where the future of tariffs remains uncertain. Looking globally, Japan’s export downturn was widespread with all but one of the 18 sectors tracked by Panjiva seeing a drop...