sir1963:
But, out pops the surprise that Ukraine used a naughty weapons (supplied and used by Russia against its own people) and so with extreme reluctance Russia has had to use Nukes.
There are 2 alternatives
Putin knows he will also be a casualty if Nukes are used
or
He has realised that the threats of their use backfired, the west did not back down, and sanctions/war losses are making things worse.
He is guided by his love of the USSR, make Russia Great Again, that's his legacy. Using nukes will end that, he won't want that type of legacy. Ideally he wants an end to the war, but not him ending it, he needs somehow for UKR to come to the negotiating table, but that's not going to happen. Its a stalemate. But UKR can keep fighting as they have the will and the support. Ultimately UKR will join NATO.
He has stated that they will not use nukes. Being pushed out of Kherson. They are aiming to reduce UKR energy for Winter, in some ways that show that Russia cannot win a war by fighting, so they are using strangulation instead. Its becoming a stubborn vs stubborn type of conflict
Having said all that, Putin's word has no value, and as you say, he may find an excuse to use nukes, to save face internally, who knows. What we do know is that Russia is screwed, win lose or draw. I read that EU is awash with energy storage, it has all backfired
But again, who knows