The article linked below also mentions the recent talks between both sides seem to hold out some hope of a settlement in the not too distant future. As much as I would like to see Putin completely defeated and to have to go home with his tail between his legs that could possibly mean extremely bad news for us all.
Putin knows that if he is seen to have lost this war it will almost certainly be the end of him, he will either be arrested or murdered so he will do everything he can to prevent this situation. I could easily see him ordering the use of tactical nuclear weapons, these are not the ones that destroy entire cities but are around the size that would completely flatten a football stadium.
If he was to fire a couple of these weapons into some Ukraine military bases with the threat of using more then what could Ukraine and the west do to stop him?
We don't have any tactical nuclear weapons but I think the French do and I imagine the US does as well but if we used them on the Russians Putin would probably ratchet up things again, I think he will do anything to ensure he is not seen to have been defeated, hence my mention in a previous post that he needs a golden ladder to climb down.
Here is the link.
Talks between Russia and Ukraine to resume after deadly attack on military base | Ukraine | The Guardian