A convoy of unmarked military vehicles in Donetsk
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Ukraine tensions: OSCE warns real "risk of further escalation"

There have been more stark warnings about the risk of a return to all-out conflict in eastern Ukraine.

The Organisation for Security and Cooperation in Europe warned of a real "risk of further escalation".

Meanwhile NATO's European commander has expressed concern about the build-up of troops and weapons by the Russian-backed separatists.

David Stern reports from the Ukrainian capital Kiev.

  • 11 Nov 2014
  • From the section Europe
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