President Xi Jinping of China likes to call his core foreign policy strategy “win-win.” And President Trump likes to win. So at a steakhouse in a sleek, new hotel in Beijing on Friday, there was a celebration of the most tangible result of the unexpected cooperation that emerged in the first months of Mr. Trump’s presidency: the lifting of a ban on American beef imports. The event, which included a ceremonial carving of a slab of bone-in rib-eye flown in for the occasion, might have symbolized the promise of a constructive era — except the Trump administration seemed to forget that the “win-win” part requires reciprocation, not retaliation.
