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.

Here’s a quick guide to the Trump administration’s talks with a number of different countries about tariffs and trade, as markets prepare for another week of headlines and signs of potential agreements.

Propane is among the most important products that the U.S. sells to China, which turns it into plastic and sells it back.