Beijing’s moves have included flying bombers near Japan, detaining businesspeople and restricting the exports of rare earths.

From his post in New Delhi, Mr. Gor has become a force in U.S. foreign policy, chasing business deals and stunning diplomats by reversing a long-planned embassy building project.

© Saumya Khandelwal for The New York Times

America’s transactional approach to Europe is carrying over to Asia.

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© Ezra Acayan/Getty Images

The Pentagon chief, in a rare omission, avoided any mention of Taiwan in a speech to Asian officials.

© Achmad Ibrahim/AP

Asian nations worry that the president might trade security commitments for better economic terms with China during his planned meeting with Xi Jinping this week.

The war in Iran, trade, artificial intelligence and Taiwan are expected to be on the agenda. But expectations are modest.