I'd say that Yanukovich has pushed the button, and now it's the endgame. The police and riot forces will go in to disperse the camp, the only question is how successful they will be and how many more will die before the end.
If they fail and have to fall back...we may yet see the military involved. However, I think both sides want to avoid that, although whether it's in Klitschkos power to control the protesters is another matter entirely, he might be able to sway some of the moderates, but the 1488s aren't going to listen to anyone.
