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Foreign Secretary Liz Truss is going to Ukraine as questions remain over Russian claims it has pulled troops back from the country's border.
Russia's defence ministry claimed on Tuesday it was removing forces after the completion of military exercises.
But a senior US official said another 7,000 troops had arrived in recent days.
Writing in the Telegraph, Ms Truss warned the West "must not be lulled into a false sense of security".
She said there was "currently no evidence" Russia was withdrawing, adding: "We must have no illusions that Russia could drag this out much longer in a brazen ploy to spend weeks more - if not months - subverting Ukraine and challenging Western unity.
"This is a test of our mettle."