What is DeepSeek? And How Is It Upending A.I.?

How did a little-known Chinese start-up cause the markets and U.S. tech giants to quake? Here’s what to know.

Biden Administration Adopts Rules to Guide A.I.’s Global Spread

New rules aim to keep advanced technology out of China and to ensure that cutting-edge artificial intelligence is developed by the United States and its allies.

Biden Targets China’s Chip Industry With Wider Trade Bans

New rules prohibit the sale of certain types of chips and equipment to China, in an effort to close loopholes and cement the Biden administration’s legacy in countering the U.S. rival.

Trump Plans Tariffs on Canada, China and Mexico That Could Cripple Trade

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.