Who in NATO has the willpower to do any of that though?
It will be the usual air and naval strikes from afar but after 20 years in the Middle East there will be no political appetite to put boots on the ground unless Putin is knocking on the door of Berlin or Paris, which he has no interest in doing.
They are all going to be very reluctant obviously, but I don't think I quite agree with the idea that the west is going to sit on their hands in this scenario. They have in the past... that's where this narrative comes from, but I don't think there is a past event we can compare to this scenario?
We are talking about an open declaration of war and invasion of the largest country in Europe (aside from the aggressor), without anything close to a legitimate reason. You would have to go back to WW2 to find something comparable, and we all know how that turned out.
This will be incredible if he actually goes through with it, the act of a madman. I don't think he will personally, he has proven to be an evil cnut happy to watch his own countrymen die for his own gain... but this is another level entirely.
I gotta admit though, looking at the daily increases of troops and equipment being transferred all accross the Ukranian border en masse... Its looking scary.