The Turkish government believes the U.S. will not apply planned sanctions following Turkey’s purchase of Russia’s S-400 weapons system. The debate comes just over a year since the U.S. applied increased steel tariffs in retaliation for Turkey’s detention of an American cleric. The prior deterioration in relations has only led to a slowdown the growth in trade between the two countries, not an outright reversal. U.S. imports from Turkey rose 4.6% year over year in the 12 months to Jul. 31 compared to a 13.9% rise in the prior three months. Steel imports dropped 39.2% over the same period,...