Video of Ukraine Soldiers Shooting AK-47, Sniper Rifle at People as Truce Fails, 25 More Die - YouTube
Police seemed to be armed with typical AK74's and what seems to be some kind of bolt action rifle. Looks almost Sig like but its hard to tell, doesn't really matter. Bolt action, glass on top, probably chambered for some sort of .30 cal round, might even be 7.62x54R.