Nato does not have many toys to bring to the game. The only countries with decent heavy armor units in europe are the former easern bloc coubtries. The ones that just wiped the floor with our strykers inthe war games late last year.
This.
We have ONE, count them ONE, Battalion of M1 Abrams in Europe. Don't have any troops to man them (they are there for units to use when they rotate through for training at Grafenwoehr). We have ONE, count them ONE, Regiment of Strykers. Which as Roo_ster pointed out, got mauled by every single heavy armor unit from every NATO country in last years war games. I mean good ol' fashioned *expletive deleted*ss-kickings. We have, at last count 33,000 troops in Germany.
Germany has THREE, count them THREE, Battalion of Leopards. And three divisions. The entire Heer (army) is 80,000 troops total.
Not sure what the Poles have, but I can't see them as real ambitious to go to/through the Ukraine to protect them. Especially with Russia friendly Belarus right on their border.
So to sum up: There ain't much we or NATO could do militarily to Russia to stop what they are doing and any attempt to do so simply fills the Butcher's Bill for no gain/good purpose.
And I really don't like the idea of Putin Sudetenlanding the Crimea and eastern parts of Ukraine, but we are to weak to stop it.
It's up to Ukraine to do what they can, should that result in an all out invasion, that *Might* change things. But given the weak waffle we have in the White House, it's doubtful.