NATO Secretary General Anders Fogh Rasmussen has spoken of an alarming build-up of Russian ground and air forces close to the border with Ukraine.
He condemned Russia for sending a "so-called humanitarian convoy" into Ukraine without the consent of the Ukrainian authorities.
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Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.