So when is it OK to take over government buildings when you don’t like the government?
http://news.yahoo.com/ukraine-protesters-seize-kiev-central-post-office-151149268.html
raided the local headquarters of the state prosecutor, the state security service and several district police stations. Around 140 guns were seized from a police armory.
http://www.nytimes.com/2014/02/20/world/europe/ukraine.html
If some group overthrows your government, then yes, by all means you should try and take the country back again.