Six policemen died in Tuesday's riots, while another 39 officers sustained gunshot wounds, according to the Ukrainian Police. More than 100 other officers were injured.
At least seven protesters were also killed in clashes with the police.
Ukrainian riot police started to move into Kiev's Independence Square late on Tuesday, pushing back anti-government protesters whose tents were burning, local television showed.
Live television footage showed riot police throwing stun grenades at protesters separated from them by a line of burning tents, tires and wood.