U.S. troops will be deployed to NATO allies in Eastern Europe.

President Biden has approved the deployment of about 3,000 additional American troops to Eastern Europe, administration officials said on Wednesday.

The troops, including 1,000 already in Germany, will head to Poland and Romania, the Pentagon spokesman, John F. Kirby, said. Their purpose will be to reassure NATO allies that while the United States has no intention of sending troops into Ukraine, where President Vladimir V. Putin of Russia has been threatening an invasion, Mr. Biden would protect America’s NATO allies from any Russian aggression.