Riot police and Interior Ministry members stand in formation during clashes with pro-European protesters in Kiev January 22, 2014 (Photo: Reuters)

Pro-European protesters walk towards a fire during street violence in Kiev January 23, 2014 (Photo: Reuters)

Smoke from burning tyres blanket Independence Square with pro-European integration protesters camped there in central Kiev January 23, 2014 (Photo: Reuters)

People walk near burning tires at the site of clashes of pro-European integration protesters with riot police in Kiev January 23, 2014 (Photo: Reuters)

A protester aims fireworks at police during clashes, in central Kiev, Ukraine, Thursday Jan. 23, 2014 (Photo: AP)

A protester using traffic sign as a shield attends clashes with police in central Kiev, Ukraine, Thursday Jan. 23, 2014 (Photo: AP)

A protester walks pass burning tyres in central Kiev, Ukraine, Thursday Jan. 23, 2014 (Photo: AP)

Protesters use a large slingshot to hurl a Molotov cocktail at police in central Kiev, Ukraine, Thursday Jan. 23, 2014 (Photo: AP)

Pro-European integration protesters gather in front of burning tyres during clashes with riot police in Kiev January 23, 2014 (Photo: Reuters)

A pro-European integration protester walks at the site of clashes with riot police in Kiev January 23, 2014 (Photo: Reuters)

Pro-European integration protesters shoot using a big slingshot towards riot police in Kiev January 23, 2014 (Photo: Reuters)

Protesters use a large slingshot to hurl rocks at police in central Kiev, Ukraine, Thursday Jan. 23, 2014 (Photo: AP)