I read the page. There are no facts contained therein, just someone posting a link to a BBC article about the venerable Ukrainian legal scholar Vladimir Putin's opinion on the legality of the events. Additionally, some other people share their opinions.
You might want to double check that link you posted.
And in case you're wondering, no, they didn't impeach the President or follow the constitution when seizing power.
http://politics.stackexchange.com/questions/2849/was-the-cha...