Separatists build barricades in eastern Ukraine

A pro-Russian protester stands at a barricade outside a regional government building. Credit: Reuters\Maks Levin

Pro-Russian separatists have reinforced barricades around official buildings in the eastern city of Luhansk and have asked Russian president Vladimir Putin for help after the government in Kiev warned it could use force to restore control.

More: 'Russian agents' behind unrest in Ukraine

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Russian govt: We will respond to attack on our interests

Russia's Foreign Minister has warned Ukraine his country will respond if its interests are threatened. Sergei Lavrov's words came as Ukraine's Deputy Prime Minister announced new "anti-terrorist" action against separatists in eastern Ukraine.