Putin had better be hoping and praying NATO or other forces aren't dragged directly and openly into it, either deliberately or by misadventure. A new ball game then and has to be a real possibility in the circumstances I'm guessing. This is far from over.
Give a Tyrant 1 inch and they'll take a mile which is what Putin is doing and the 'West' has something to answer for in not jumping on him more harshly in his earlier aggressive, expansionist cross border adventures I think.