Pastor Ezra Jin Mingri at his home near Washington on Thursday. His release from jail was a rare concession by China after President Trump raised his case.

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

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.

Crowds lining up for a civil service exam in Nanjing, China, in December.