Not for now. But keep in mind unless American politicians don't change their aggressive attitude towards the sovereign nations around the globe, the US will have more than Russia to worry about.

No, but if the Russians keep pushing, we may end up at war with Russia someday.

no, the USA is not going to war of that.

No way. We are just winding down from a long and expensive war. Americans are war weary, and just can't jump into another conflict right now. And Russia knows it! So Russia will just mow over the Ukraine and the U.S.and the European union will let them. The United nations might whine a bit. But it won't make a difference. They didn't help Rwanda, or Serbia or Croatia. They won't help now

For that you'll need a Republican in the White House.

Of course not. America never goes to war with a country which they think they won't be able to beat...

no

No