Elon Musk and Tim Cook, far right, were among the U.S. chief executives in attendance during a state banquet in Beijing last week.

Jensen Huang, the chief executive of Nvidia, said he did not bring up the chip with Chinese officials in Beijing last week.

Steel pipes await export in Lianyungang, China. The country’s trade surplus reached nearly $1.2 trillion last year as exports continued to outpace imports.

Representative Eric Swalwell of California, one of President Trump’s most vocal critics in the House, said that he was being targeted by the Trump administration.

A truck hauling material out of a mining valley for heavy rare earth metals on the outskirts of Longnan, China, in April.

Víctor Feliu at his chocolate company in Mexico. The changing rules for sending goods to the United States have forced him to pause his U.S. shipments.

Beluga whales swimming in a tank at Marineland amusement park in Niagara Falls, Ontario, in 2023.

President Trump and Jensen Huang of Nvidia in April. The Nvidia leader persuaded the president to approve A.I. chip sales by arguing that preventing them would only hurt U.S. tech companies.

The BYD Explorer No. 1, carrying 5,000 electric cars, at a stop in Singapore last year on its way to the Netherlands.

Jensen Huang, Nvidia’s chief executive, last month. Mr. Huang and President Trump struck the 15 percent arrangement at a White House meeting last week.

An ambulance burned in an Israeli attack in Tehran last month. Despite the appearance of unity, Russia, China and North Korea did not rush to Iran’s aid during its war with Israel or when U.S. forces bombed Iranian nuclear sites.

The West Lake in Hangzhou, China. The city has become a hub for artificial intelligence start-ups, helped along by government subsidies and tax breaks.

Group14 Technologies, a start-up, slowed the construction of a battery materials factory in Moses Lake, Wash., after its customers in China balked at paying higher tariffs.

Facebook’s C.E.O. Mark Zuckerberg rings the Nasdaq’s opening bell from Facebook’s headquarters in Menlo Park, Calif., on May 18, 2012, the day of the company’s initial public offering, while Sheryl Sandberg, Facebook’s C.O.O., looks on.