Ukraine’s President Volodymyr Zelensky has given a defiant speech to his nation, declaring that 16th February, the date on which US said Russia could launch an attack, would be a "day of unity”.
Russia denies it plans to invade Ukraine, despite massing more than 100,000 troops on the border.
The Kremlin says it cannot accept that Ukraine – a former Soviet republic with deep social and cultural ties with Russia – could one day join Nato, and has demanded that this is ruled out.
More than a dozen nations have urged their citizens to leave Ukraine, and the United States has said an attack could begin "at any time". However the US has said not all hope is over of a diplomatic solution to the Ukraine crisis.
Clive Myrie presents BBC News at Ten reporting by Sarah Rainsford in Kyiv, Steve Rosenberg in Moscow and Sarah Smith in Washington.
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