Live stream of this happening:
http://www.youtube.com/watch?v=jrZcAsPKK74

They are busting out the siege equipment! Drop the Trebuchet!

http://www.liveleak.com/view?i=6d0_1390249837

Highlights of the siege!

http://www.youtube.com/watch?v=LaxKgNmrZvo

and lastly information on whats going on.

The Ukrainian government illegally passed brutal legislation without following proper parliamentary procedure.
Since Ukraine has no independent judiciary to nullify the illegal laws, the Ukrainian people have a mandate to use violence against the government until said legislation is repealed.