The White House is warning that a Russian attack on Ukraine may be imminent.
After a huge build up of Russian troops near the Ukrainian border, American officials say Moscow now has the capability to launch a major military operation, including an attack on the capital Kyiv.
Moscow has practically encircled its smaller neighbour, with close to 130,000 troops. It says they are carrying out training exercises and maintains no invasion is being planned.
Diplomatic efforts are continuing to defuse the crisis.
Clive Myrie presents BBC News at Ten reporting by north America editor Sarah Smith in Washington.
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