Earlier quoted context omitted.
Russia remains a nuclear power. NATO should be and is careful. I agree they know they can’t win but they now need an exit ramp. That’s what I personally read in their posture. It would probably be wise to give them one.
The "exit ramp" is that they withdraw from Ukraine, or at the very very least they withdraw to the lines that existed before 2022. I'm really not sure what else people who say this mean.
The alternative is escalation and that doesn’t seem to end well. It might be what the USA wants - they are unlikely to be the ones nuked after all but Europe would be bearing the most of it and that’s not something I wish.