HONG KONG — Chinese President Xi Jinping met with veteran U.S. diplomat Henry Kissinger in Beijing on Thursday, calling him an “old friend,” Chinese state media reported. Xi said the visit by Kissinger, who has been to China more than 100 times and recently turned 100, had special significance because of the two “hundreds.” Kissinger, who was Richard Nixon’s national security adviser, made a secret trip to China to 1971 that laid the groundwork for a historic trip by the president the following year and the formalization of relations between the United States and China in 1979. “It not only...