Earlier quoted context omitted.
What I mean is that we need to use diplomacy to allow Russia a way to enter negotiations and stop the war while keeping a modicum of face. There is absolutely no chance Russia just leaves Ukraine on their own while saying "we have lost, we were bad and will now behave as you wish" so there would be little point insisting on that. If what we want is a come back to pre-invasion frontiers we need to give them a way to s…
Russia has plenty of nukes for the US and Europe if Putin decides the murder-suicide path is the only way forward. The problem with your line of thinking is that Russia needs to lose. It's citizens need to understand that it has lost. Germany after WWI didn't and it gave rise to the stab in the back myth and nationalism. If Russia is allowed to spin anything as a victory here, it and it's citizens would learn nothing…
Nuclear countries must not be allowed to take what they want and threaten nuclear destruction if anyone tries to stop them.
That would be a terrible outcome.