It's really not shocking at all when you take into account three things:
I actually think Russia is in the right here. They've intervened and will cause a stabilizing (if moderately threatening) effect on Ukraine,
provided they stay put in Crimea. There was a legitimate concern for Russia about their Black Sea Fleet lease, similar to the situation where the
US was evicted from Uzbekistan during the Afghan War. Losing that base would put Russia in a substantial strategic conundrum (where to relocate to, loss of a really well positioned base, etc.)
I also don't think for a second that the US wouldn't perform a similar military intervention if there was substantial political unrest in
Bahrain or if
Okinawa actually
attempted to secede from Japan.
edit:
It is pretty funny watching Obama make an ass of himself three times in a row toward Russia's actions (Georgia's crisis with South Ossetia, Syria's "Red Line" with chemical weapons and Russia's peaceful intervention there, and now Crimea). All talk. He should have delegated this to our UN representative. It's their job to make strongly worded statements about how angry we are.