
President Xi Jinping of China arriving to meet António Guterres, the next secretary general of the United Nations, on Monday at the Diaoyutai State Guesthouse in Beijing. Credit Jason Lee/Reuters
BEIJING — China extended a warm welcome this week to the incoming United Nations chief, António Guterres, praising the world body and making clear that it wants a greater role there, at a time when Donald J. Trump’s election to the White House has many wondering whether American involvement will recede.