The punch-line finally landed this week: the “$900 billion victory” that Donald Trump bragged about with Tokyo and Seoul has turned into the most expensive pratfall in modern diplomacy. Let’s rewind. Two months ago the White House rolled out what it called “historic trade deals” with Japan and South Korea. The fine print was eye-watering: Seoul pledged to plough US$350 billion into American projects. Tokyo topped it with US$550 billion . Total headline figure: nine-hundred-billion dollars —more than the GDP of Saudi Arabia. But the contract language was straight out of a mob movie: Any profit, America keeps 90 percent ; the Asian partner gets 10 percent . Washington—not the investors—picks the sectors. The money had to arrive “up-front,” in cash, no strings attached. In other words: you bring the wallet, we pick the restaurant, and by the way we’re keeping the leftovers. South Korea’s national-security adviser, Cho Tae-yong, answered first. “We can’t,” he said bluntly. Seoul’s e...