If they are chanting BERKUT then they are pro-Rus not Pro-EU. Pretty simple.
Seems Berkut is something of a rally cry.
Over here in US, I asked around my work. Most didn't even know Ukraine had a revolt or just new something wasn't right over in Ukraine. To far away for the masses to care. Now a guy I know who is joining the Peace corp and I had a chat. He was actually all for Russia taking it over and letting everyone sort it for themselves(Paraphrased, but that's what he ment, though not said exactly like that). We were also discussing liklihood of something actually happening. He said Putin already won and everyone else is going to back down. Course he also agrees that the US won't do shit, and EU can't handle this cause it sucks.