China’s top diplomat, Wang Yi, concluded his visit to South Korea on Friday, but declined to back Seoul’s push for multiparty peace talks involving the North. His two‑day trip, which followed President Xi Jinping’s first visit to Pyongyang in seven years in June, coincided with US President Donald Trump’s decision to scale back joint military exercises with South Korea and call for further talks with the North. North Korea, however, responded with more than 10 short-range ballistic missile...