A U.S. and Vietnam trade deal has been reached that means Vietnam will avoid the most severe tariff rates—set to go back up next week—but there’s a catch that could anger Vietnam’s largest trading partner, China. The deal, announced Wednesday, will mean Vietnamese exports to the U.S. are tariffed at a 20% rate—lower than the initial 46% “reciprocal” tariff announced in April, but double the 10% universal tariff. Goods that are deemed to be transshipped, however, will be tariffed at a 40% rate—a