Ukrainian troops are beginning their withdrawal from the key town of Debaltseve. The success of pro-Russian rebels in defeating government forces in the town may be just the beginning of their next push westwards. Subscribe to Channel 4 News: http://bit.ly/1sF6pOJ Inside Ukraine: the battle for the east: http://bit.ly/1EVIAqJ Top stories: http://bit.ly/1wdbIG1

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