The US government has temporarily banned carry-on liquids, aerosols, gels and powders on direct flights between Russia and the United States.
The restrictions come days after officials warned that explosives could be smuggled on flights to Russia in toothpaste tubes.
Airline security has been elevated in the lead up to the Winter Olympic games in the Russian city of Sochi, which start today.
The move was announced by Delta Air Lines, the only American carrier with regularly scheduled services to Russia, on its website yesterday.
The temporary restrictions, are reported to last until the end of the Olympics on February 21.
They exclude prescription medications and do not apply to checked luggage.
Last month, Russia banned all liquids, pastes and gels from its airports and internal flights.