Yep, Russia is now involved, and America's government is making yet another empty threat. We'd be complete idiots to get involved- Ukraine's revolution has little to nothing to do with us. Let Europe get involved if it wants to, but it won't win any war without our help.
America's obligations in treaty are quite complicated, they could be requested to act under their membership of the UN or NATO and most particularly by their undertakings in the Budapest Memorandum to support Ukraine's independence.
Technically if Russia is seen to intervene then America may be bound to take some action. Realistically I think that's a very unlikely end-result. I hope that sensible diplomacy will take precedence over posturing.
Every Ukrainian's vote must be counted fairly so that full legitimacy can be restored to the parliament in the eyes of the country and of the world. Crimean MPs aren't unilaterally coming out in favour of either the 'old' or 'separatist' regimes and are continuing to attend votes quite normally in the body of parliament.
The people of Ukraine seem keen to see a sensible, self-regulated future. If they express a genuine desire (through open democratic process) to form two constituent states within Ukraine which seems the most appropriate likely solution if separatism is a desire of the people, at least according to some Prof on the radio today who seemed, like,
well clever.
Russia has a right to protect her assets in Ukraine and should also consider requests from the Ukrainian parliament for police aid if required. Other than that I don't feel she should be acting on foreign soil at all, although I don't know the terms of any military treaties that she has with Ukraine.
@
Rage Racer ; the same radio Professor said that securing the airports was a logical step for troop movements. That was just after the airport was secured by armed men who identified themselves to a BBC reporter on the scene as "normal Crimeans. We are teachers, we are from offices, we are a brigade to protect our town from damage. We are just people".
They were very well armed though, and that's what counted.