I'm following this on behalf of http://grasswire.com - and a lot has changed since this article was written. I'll update this comment as frequently as possible.

* Update 18: More protesters entering EuroMaidan camp right now, many carrying tires. They've burned tires during these clashes to create a smokescreen.

* Update 17: Ukraine to restrict traffic to Kyiv starting at midnight tonight

* Update 16: Armored vehicles are entering the square. One has been set on fire by protestors.

* Update 15: An emergency meeting has been called between Yanykovytch and opposition leaders.

* Update 14: Protestors have united in singing national anthem of Ukraine as flashbang grenades, rubber and plastic bullets ring out. http://www.livestream.com/activistworldnewsnow

* Update 13: Police reinforcements have arrived, barricade has been torn down. Protestors using laser pointers to blind police. Rubber bullets being fired constantly.

* Update 12: Police storming with water cannons and rubber bullets

* Update 11: Last few livestreams: http://www.livestream.com/activistworldnewsnow

* Update 10: More streams going dead. This one is still live - https://www.youtube.com/watch?v=PbQC7_TNQPw

* Update 9: The militia is storming the square. (personal commentary - this will not be good).

* Update 8: Chaos is breaking out. Fireworks and explosions everywhere. Livestream: http://www.livestream.com/activistworldnewsnow

* Update 7: Better livestream: http://www.ustream.tv/channel/live-action-spilno-tv

* Update 6: 10 police buses and 3 water cannons are now waiting on Institutsksa street

* Update 5: Militia making loudspeaker announcement at Institutska st. "Please leave Maidan as an anti-terrorist operation will take place"

* Update 4: Live feeds are disappearing. We're worried the Internet will be cut soon.

* Update 3: BTR/machine guns on a tripod spotted at the bank "Khreschatyk"

* Update 2: Riot forces are blocking all paths to and from the central square (Maidan)

* Update 1: the square is now surrounded by military forces

* Just a few minutes ago the promised "ceasefire" ended, and police are moving toward the square.

* Livestream: http://www.livestream.com/activistworldnewsnow

* Two BTRs were recently heard.

* The main pro-protestor channel, Channel 5, had its signal cut

* Video of military APCs arriving in Kyiv, heading toward downtown http://t.co/ujaGa62OIg