1 - Pro-Russian, heavily armed men have taken over the regional parliament building in Crimea and raised the Russian flag (imagine Azaris or Kurds taking over government buildings and raising Kurdistan or Azerbaijan flags in Iran!)
2 - There are allegations from the ex finance minister that Ynukovich stole $37-75 billion USD (billion, not million) from the state treasury.
Ynukovich is very corrupt and indeed would have probably lost the next election.
Ukraine GDP though is only like 300-400 billion per annum and that figure would be 10% of GDP.
All That aside the most important issue remains whether the EU and the U.S are going to push IMF to hand over temporary backstop for Ukranians Bonds which their maturity is around the corner in two weeks.
I don't think Russia is gone take military action. They are more likely touse their Natural Gas Trump Card again. They will press Ukraine to pay back its Gas Debt like they did back 2007-2009 period.