The present leader at least won an election that was considered fair, and I don't see crowds on the streets of Kiev screaming for his removal. The last 'president' poisoned one opponent, jailed another and then did a runner with millions in cash.
A election which only happens in some parts of the country isn't a democratic election.
The Ukraine is a deeply divided country; your argument about the crowds in Kiev just proves that you don't understand the fundamental problem of this country.
And the current president is a political ***** who was always on the right side, he is part of the system that produced this mess. Until 2013 he was the minister of trade.
Let me guess, the terrorists bought their surface-to-air guided missiles at the same cornerstore where the little green men in Crimea bought their equipment, right?
Other possibilities:
a) they were kept in the largest Ukrainian weapons stash, which the rebels captured... or maybe they didn't, no one knows it exactly
b) they were stationed at Ukrainian barracks, which the rebels captured
c) Ukrainian soldiers changed sides with their equipment
d) the equipment was bought on the grey market
e) the Ukrainian army shot down the plane
f) the plane wasn't shot down by a surface-to-air missile but by something else, like a jet figher
See, nothing is known, there are several plausible possibilities, but despite all this you are absolutely sure that only the rebels with their missiles from Russia can be blamed. You blindly believe the propaganda of one side. Sapere Aude, Harry.