Holy crap! How widespread is that sentiment?
Now that I'm against violent revolution out of principle, but this might get nasty if it blows up - the Prague Spring comes to mind...
What exactly do you mean by fighting police? Throwing rocks, throwing molotov cocktails, throwing grenades? It's pretty open...
General mood... I'd say aggressive confusion it's hard to predict what will come out of that. I and my friends don't really count because we are members of nationalist party so much more radical than average persons. While more radical people like me were pissed with all that "peaceful and not political pro european demonstrations" crap. Most never wanted active action. Now moderates got quite shocked when three thousands of riot police, without any warnings, attacked 300 (with most of them being teenagers). It was a violent, demonstrative, sadistic beatings by police from Crimea (Read Russians). Many got severe injuries, including broken arms and legs. And, I repeat, police never hesitated to beat 17 year old girls.
The most active action is expected tomorrow (Large opposition gathering is planned ) or this night if they'll dare to use force against the new crowd that formed rather spontaneously (10000+ and rising)
ATM, It's highly unlikely that the crowd will start the action first (it is coordinated and calmed down by opposition politics, not some mob), but if attacked they will not fold easily. Current chants include "Revolution!" "Glory to the Nation, Death to the Enemies!" and other stuff like that, atmosphere is far, far from peaceful
Opposition calls for a nationwide strike starting from tomorrow and further plans to be announced later
Also, There are unconfirmed rumors that riot police in several Western cities ignored orders.