A protester fires off fireworks towards riot police during clashes in Kiev, UkraineReutersProtesters use a large slingshot to hurl rocks at policeAPA protester wearing a gas mask and cloak walks among burning tyresReutersA protester throws a Molotov cocktail towards police linesAPA protester points a handgun during a clash with police in KievAPProtesters wearing armour and improvised protective gear prepare for a clash with riot policeAPProtesters clad in improvised protective gear prepare for a clash with policeAPPro-European integration protesters take cover from water sprayed from a fire engineReutersPro-European integration protesters take cover as a fire engine sprays them with a jet of water at the site of clashes with riot police in KievReutersA pro-European integration protester walks among burning tyres under water sprayed from a fire engine at the site of clashes with riot police in KievReutersA protester looks out of an ice-encrusted burnt-out vehicle at the site of clashes with riot police in KievReutersA protester prepares to throw a Molotov cocktail during clashes with policeAPA pro-European protester throws a burning tyre during clashes with riot policeReutersOpposition leader and former WBC heavyweight boxing champion Vitali Klitschko addresses protesters near the burning barricadesAPOrthodox priests pray as they stand between pro-European Union activists and police linesAPA pro-European integration protester throws rocks towards riot police as others take cover in KievReutersA riot policeman throws a Molotov cocktail during clashes with pro-European protesters in KievReutersRiot police officers pose for a picture near burnt-out vehicles during clashes with pro-European protesters in KievReutersPro-European protesters carry Molotov cocktails during clashes with riot police in KievReutersRiot police officers take cover behind shields during violent protests in KievReutersA riot police officer peers out as his colleagues take cover behind shields during clashes with pro-European protestersReutersRiot police officers detain a man on the ground during clashes in KievReutersA pro-European integration protester catches fire during clashes with police in Kiev, UkraineReutersA pro-European integration protester sits in a burnt-out police bus the day after the rally in KievReutersOpposition leader and former WBC heavyweight boxing champion Vitali Klitschko is attacked and sprayed with a fire extinguisher as he tries to stop the clashes between police and protestersAP