Huh?  In what way?  They won't put up with Russia invading a member  of the alliance?   Well if you consider that a threat to Russia I guess you're as paranoid as Putin.     A few???  The infamous war pig, John McCain was the only politician in the U.S. or the world for that matter that I could  ever remember advocating war with Russia.    FFS, he didn't see a potential war he didn't like.  He was a madman.  
Russia for sure has their share of those types.  There was talk of taking back Alaska  by some of them at the beginning of the war.  Fortunately, there are still a few cooler heads in Russia.
There's really no point in discussing this topic with you anymore.
It's like two different people see the same animal and one swears he's seeing a giraffe, the other swears he sees an elephant.
Let's do this for a change...
How would you like to see this conflict end?  No, forget that, I'm pretty sure I know the answer to that.  Realistically what would be, to you,  an acceptable negotiated end to the war?