Weak on Kosovo Obama. "Work with the international community" in the event of a Russian invasion. I think troops would be in order.
You'd risk war with Russia?
You'd allow Russia to invade Europe whenever it wants?
I think, if Russia invaded anywhere in Europe except Belarus, the EU just might respond. And then the US would be working with the international community.
Not watching the debate, of course. 
But you do realize that if Russia wants to get involved, they'll probably fight a proxy war through that area.
And I wouldn't count on the EU doing anything in that area of the world. It took them nearly 7 years to get involved last time, and only after we pushed them time and time again on it.
But whatever, the US involvement in this area was a function of neo-conservative/neo-liberal thought. Apparently not popular around here except when the Dems push it (which of course is anywhere but Iraq).
I think you're ignoring fundamental changes in the EU since Kosovo. The EU has a lot of new members, most of whom are very hostile towards Russia.
The EU is also far more invested in eastern Europe than it was in the 1990s; during the Kosovo War, the only EU member in eastern Europe was Greece (and maybe Finland depending on your definition of eastern Europe). Today, EU members in eastern Europe and western Europe are about equal in number.
Furthermore, the EU has made it a serious goal to "normalize" the Balkans. Croatia will join the EU by 2010. Macedonia may accede as soon as 2012. There are even talks of Montenegro becoming an official candidate country some time this year. The EU is not going to let such things be thrown off course by a war right on those countries' doorstep; it just won't stand for Russian interference in the Balkans the way it did in the 1990s.
