Meanwhile Putin talks of a nuclear option:
https://asianatimes.com/analysis-of-putins-nuclear-threat/Analysis of Putin’s nuclear threat
Saurabh Sarda
March 3, 2022

“Russia’s nuclear arsenal is vast, with 14,000 atomic bombs in storage. Russia has around 2,400 strategic nuclear weapons, the majority of which are linked to the intercontinental ballistic missile force, according to Lanoszka. The majority of these weapons, however, are not instantly useable.
“Russia is thought to have 1,600 tactical nuclear weapons deployed… Most of these tactical nukes would be carried by sea, but many more would be transported by air or even ground.”
Russia is the world’s most immense nuclear power with its nuclear arsenal, closely followed by the United States. Together, they control over 93 per cent of the world’s nuclear weapons. The United States has 3,750 active and non-nuclear warheads, with 150 of them stationed in Europe.
The United Kingdom maintains a sea-based deterrent of roughly 225 nuclear weapons, with about half operationally accessible on four submarines. One-third or so are on active deployment at any given time. According to Lanoszka, France possesses a nuclear stockpile of roughly 300 nuclear weapons.
“MAD is meant to apply – but we didn’t expect Putin to invade a sovereign country and put Russian military in jeopardy with over 4,200 casualties.” Putin is putting soldiers’ lives in jeopardy as if they were players in a chess match. Because nuclear deterrence needs a logical decision, as we learned from the 1962 Cuban missile crisis, these factors make it impossible for it to work correctly,” she said.
“A nuclear assault on a tactical level is doable, but it will lead to a disastrous MAD escalation.”