President Trump says he wants Xi Jinping, China’s leader, to call him to talk tariffs. Mr. Xi is ghosting Mr. Trump, and markets are plummeting.

A professor at M.I.T. on how Xi Jinping is likely to respond to U.S. tariffs and why the standoff won’t weaken the Chinese Communist Party’s grip on power.

China has appointed a new trade negotiator in the midst of its tariff fight with the United States as the world’s two largest economies steadily increase tariffs on each other’s goods.