Ukraine didn't join military alliances. This isn't our war.
Russia has done lots of things before this, but they weren't invasion of a sovereign nation.
We don't approve of this war ethically or morally. Russia is no longer invited to be involved with us in any way.
https://en.wikipedia.org/wiki/Anschluss
https://en.wikipedia.org/wiki/Munich_Agreement
https://en.wikipedia.org/wiki/Phoney_War (or "Sitzkrieg")
And, most ridiculous of all:
https://en.wikipedia.org/wiki/Western_betrayal#Beginning_of_...
There is a point where war is unavoidable, and the problem with fights between 2 parties is simple: if one party believes it is in a fight ... you're in a fight. It does not matter what the other party thinks.
If Putin believes we're at war with Russia, we are at war with Russia and we will need to fight. Fight a little or a lot? Today we could fight a little. Tomorrow we will have to fight a lot.
I think not. If Putin agrees, we may well find out.