@panzade,
Come on?
First of all, I don't think that sending troops to a nation to counter the invasion of a neighboring nation can be considered an
invasion.
Secondly, if sanctions are being threatened against Russia rather than the Ukrainian strongman and his thugs, they represent a hollow threat. Russia can certainly survive any and all Western sanctions for the period of time required for its invasion to have Putin's desired effect, and when he withdraws his troops, the sanctions will fade away.
I'm not advocating going to war with Russia over the Ukraine. The time to check Putin's adventurism has come and gone. The Great Game is very similar to a game of chicken and Obama, long ago, revealed he will always run off into the ditch .
When you speak softly and carry a big stick, it is implied that the people to whom you are speaking are well aware of your cudgel and perceive that your are willing to use it. Putin is well aware of our Big Stick, but he is also aware that there isn't a snowball's chance in Hell that Obama will wield it.
The only way Obama can reclaim American credibility is to do something stupid. He won't, and not because he is smart, and so the rest of the world will be boarding the US lion for the next three years.