Putin expresses 'utmost concern' over Ukraine to PM

Russian President Vladimir Putin has expressed his "utmost concern" over the escalation of violence in Ukraine during conversations with David Cameron and German Chancellor Angela Merkel.

Vladimir Putin with David Cameron last year. Credit: Kay Nietfeld/DPA

The Kremlin said in a statement: "Vladimir Putin stressed the critical importance of an immediate end to bloodshed, the need to take urgent measures to stabilise the situation and suppress extremist and terrorist attacks."

Watch: 'Central Kiev is beginning to look like a war zone'

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Ukraine warns Russia against 'act of aggression' in Crimea

Ukraine's acting president has warned Russia that troop movements outside its naval base in Crimea would be seen as an "act of aggression". Armed men seized regional government headquarters and parliament and the Russian flag is flying from buildings