Overnight clashes between anti-government protesters and police in Independence Square. Photograph: ITAR-TASS/Barcroft Media

Anti-government protesters man barricades. Photograph: Jeff J Mitchell/ Getty Images

Smoke hangs over Independence square. Photograph: Jeff J Mitchell/ Getty Images

Protesters build barricades while others continue their stand-off with police. Photograph: Jeff J Mitchell/ Getty Images

Protesters stand behind burning barricades. Photograph: Bulent Kilic/ AFP/Getty Images

Protesters pick their way through burning barricades. Photograph: Bulent Kilic/ AFP/Getty Images

Protesters rally round the monument to the founders of Kiev in Independence Square. Photograph: Jeff J Mitchell/ Getty Images

A demonstrator stands on the balcony of a burnt-out building overlooking the square. Photograph: Bulent Kilic/ AFP/Getty Images