US President Donald Trump’s announcement that he will visit China “at some point” this year sets the stage for an unusually frequent series of face-to-face meetings between the American and Chinese leaders – potentially up to four encounters in 2026.The two leaders have already met once this year for a summit in Beijing and Xi is expected to travel to the United States in September for a state visit and again in December for the Group of 20 meeting.Unveiling a new US presidential plane on...