I think history is just repeating itself, no? This is a game the Russians know (and play) very well.
Russia's been fairly docile recently with that whole "democracy" thing and the economic troubles. But corruption is still running rampant and now Russia has the means and the will to protect their interests. Since the turn of the millennium, Russia has been the fastest growing economy in the G8. Economic recovery can post those kinds of results.
And now, with that, they have these concerns about their integrity as a nation, both in terms of economy and security. They don't want these sorts of things to undermine their power, and so they take action.
Doesn't the U.S. do this sort of thing too, only on a much larger scale?
I think this is heading to another cold war, unless NATO can get its act together. Moreover, the U.S. needs to be careful; they don't need to have Russia turn completely against them when it comes to the mess in the Middle East and the looming Iranian issue.