We did precisely this in Georgia in 2008 and it worked.
No one is advocating nuclear war...it is not mentioned so ou are pulling that out of thin air.
Russia doe not “have” the Ukraine. They have 2,000 troops in the Crimea, which is where their major n]=naval base on the Black Sa is. As I said, that’s lost and there is no sense in tryiong to get it back. Trying wuld start a war.
the other things deal with the sovereign territory of the Ukraine. Going in there with advisors, material and trainers would establish a position that would cause Putin to realize that the risk of trying to take all of the Ukraine would be to costly for him (just as it was in Georgia in 2008) and he would most probably stop with what he already has, which strategically is what he wanted to begin with.
What is is insanity is to do nothing. Shades of Chamberlain. But sadly...and probably ultimately tragically for Europe and the US, that is most likely what Obama will do. So you can feel secure (for a short while) in knowing you have Obama’s back in this. Bit rest assured, he does not have yours, or the rest of the country.
We and NATO were seriously considering having Ukraine to be a part of NATO, which would have been wise.
No, we didn't and it didn't.
The US flew in humanitarian supplies only, not a "security force, advisers and trainers".
We did not bring Georgia into NATO which would force a US Military response to the Russian incursion.
And, Russia is still in Ossetia.
Despite the bluster, we did nothing real to resist the Russians. And the reason cited by GW Bush was to avoid war with the Russians.