The US Transportation Security Administration is temporarily banning travelers from bringing any liquids, gels or aerosols aboard flights between the United States and Russia, an official said.
The directive came a day after the US warned airlines that extremists may target them by placing explosive materials in toothpaste or cosmetic tubes in an attempt to disrupt the Olympic Games in Sochi.
Delta Airlines, the only US airline with regularly scheduled nonstop flights to Russia, posted the warning about the Transportation Security Administration policy on Thursday.
The government warning became public on the eve of the Winter Olympics in Sochi, Russia. Homeland Security has said the government is not aware of a threat to the US.
President Barack Obama said on Thursday that Russia had an "enormous stake" in thwarting terrorism at the Sochi Olympics, adding that Washington was doing everything it could to help keep athletes safe.
"I think the Russians have an enormous stake, obviously, in preventing any kind of terrorist act or violence at these venues. They have put a lot of resources into it," Obama said in an interview with US Olympic television host NBC, AFP news agency reported.