The Pentagon has said around 8,500 combat-ready US troops are on high alert to deploy at short notice amid rising tension over Ukraine. However it made clear there are no plans to send forces to the country itself.
Russia has denied planning military action against Ukraine, despite massing 100,000 troops close to its border.
President Biden has held a video call with European allies as Western powers discuss a common strategy if Russia launches an invasion.
Some NATO members, including Denmark, Spain, Bulgaria and the Netherlands, are already sending fighter jets and warships to eastern Europe to bolster defences in the region.
Huw Edwards presents BBC News at Ten reporting by Gabriel Gatehouse in Kiev, Steve Rosenberg in Moscow and Barbara Plett Usher in Washington.
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