Activists breaking into a building in Donetsk
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Ukraine crisis: Donetsk clashes over Odessa

4 May 2014 Last updated at 11:20 BST

Pro-Russian groups in Donetsk have been reacting angrily to the deaths in Odessa.

More than 40 people died there on Friday, most of them in a fire at the Trade Unions House, where separatist protesters had barricaded themselves following running battles with pro-Kiev activists.

Sarah Rainsford reports.