The usual is happening here, misinformation by both sides.
If you read the analysts tale on that it was diplomatic speak for couldn't agree on anything.
Then there's the usual people jumping sides for various reasons, loyalty to, country, ethnicity, money etc.
The Russian military is there with the approval of the legitimate Ukrainian President.
Then there the usual elected president bit which keeps getting thrown up, regardless of the fact that his parliament voted him out. A fact that may or may not be legal.
A few things, the guy was recording his own resignation speech, before he fled. The guy tried to board a plane to flee the country, his own customs wouldn't allow it. He didn't seek sanctuary in the Russian areas or hide under the Russian Admirals desk at the Black fleets head quarters. If he was so sure of his support and legitimacy why didn't he stay in the Ukraine.