Man walks past burning barricade
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Ukraine crisis: Tensions remain high in Mariupol

10 May 2014 Last updated at 13:58 BST

Barricades have been set ablaze and tensions remain high in the Ukrainian port city of Mariupol, where at least 21 people were killed in violent clashes on Friday.

Unrest has escalated in eastern Ukraine in recent weeks, where pro-Russian separatists and pushing for a split from Kiev.

Meanwhile, France and Germany have threatened Russia with further sanctions if Ukraine's presidential election on 25 May fails to go ahead.

Mike Wooldridge reports.