Russia has for weeks been massing troops and tanks on the Ukrainian border. Ukraine has said it fears an invasion and along with Poland and Lithuania is calling for more western sanctions against Russia.

A joint statement by the countries accuses Russia of aggression and urges NATO to take action.

Russia denies that it is preparing an invasion and in turn accuses the West of threatening Russia’s security through NATO expansion.

Reeta Chakrabarti presents BBC News at Ten reporting by Moscow correspondent Steve Rosenberg.

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