The Biden administration has issued rules to govern the global spread of artificial intelligence (A.I.) chips and models. The rules aim to keep A.I. technology under the control of the United States and its allies, preventing adversaries from using it for military purposes or cyberattacks. The rules divide countries into three categories, with the US and its closest partners exempt from restrictions, countries subject to US arms embargoes facing a ban on A.I. chip purchases, and other nations subject to caps on imports. The regulations also aim to keep the most advanced A.I. models within the US and its partners by encouraging companies to build data centers in these locations.