The Berkut (acting as Yanukovych/Russian enforcers) were shooting at riot police AND protesters to try and provoke a bigger confrontation between the two - this is something eyewitnesses in both the police and protesters have both attested to witnessing. This did result in some police/protesters firing at each other in the confusion it caused.
"If it was in any way lawful Yanukovych wouldn't have to flee the country."
He didn't have to flee the country, no one made him flee the country. What he didn't want was to face justice though because the only thing that was unlawful was his used of the Berkut to kill civilians and police alike.
"Why do you think that polls manipulated by Ukrainian regime are any better than polls manipulated by Russian regime?"
Because when that poll was done there was no Ukrainian regime other than Yanukovych's.
"And even 33% wanting to secede is more than enough to demonstrate tension."
That's roughly the same amount of Scottish people that want independence from the rest of the UK, yet there is literally no tension between the English and Scots. Wanting something as a minority doesn't mean you're willing to kill, rape and riot for it - some people are mature enough to accept the democratic decision of the majority, and that if they don't, they always have the option to move to Russia if being in Russia is the most important thing to them (Hint: Ukrainians can't move to the Ukraine if they don't want to be part of Russia and the Ukraine no longer exists). What would create tension though is a minority forcing something down the throats of a majority, which is exactly what's happening with Putin's annexation of Crimea.
"It's really huge value that means that radical national stance is untenable for Ukraine."
Stop using "national", and "nationalism" like you know what it means. The only nationalist here is you, you're a Russian nationalist because you support annexation of Ukraine into Russia, you believe Russia is the mother state into which all states have been enveloped. No one here is as stupid as you though and hence no one is buying it. Go worship Putin in Moscow or something if you desperately want people who are stupid enough to follow your line of nationalist and fascist thinking.