On the contrary, the risk of nuclear war increases when Putin gets Donbas and Crimea. Because what he wants next will be even more valuable to nations with nukes.
Appeasing sounds great but at some point you run out of other people's countries.
Russia is gettin North Korean troops to fight for them because they are losing so bad, but Russia is also an aggressive superpower hell-bent on invading even more countries with far better defenses than Ukraine.
This isn't accounting for Russia's disastrous demographics problem. The biggest reason they are moving so slowly is because they can build new artillery, but are demographically forced to do everything they can to minimize casualties.
It also isn't accounting for Russia trying to get a permanent peace deal 2 months into the conflict. That's not the behavior of a country bent on conquest.
Finally, I can't take people seriously when they are basically asserting that Russia believed they could take over all of Eastern Europe with just ~200,000 troops. When Ukraine changed from regime toppling to an actual war, Russia was caught with their pants down. They had to hire Wagner and draft prisoners to buy time to start pushing soldiers through training. If they'd been planning some large invasion campaign, they would have started serious troop training a handful of years prior and have millions of already-trained troops.
When invading powers think they've prevailed and have their prey over their knee, and attempt to seal their conquest with a treaty -- they always call it a "peace deal".
You knew that, right?
It's because it's not based on fact. These people (rightly so) hate Putin. But just because you hate Putin does not mean he is capable or intending to be Hitler.
Same actually goes for Trump actually. Just because you don't like the guy doesn't mean he's literally Hitler.
It's like Charlie Brown and the football.
Do you have any evidence of these plans?
There was a press conference where they accidentally showed a diagram with arrows continuing through Ukraine into Transnistria, which is Moldova's equivalent of the Donbass.
You have to be very ignorant of geopolitics to think that there aren't more countries like Ukraine that Russia would like to return to their empire.
Some might join voluntarily but many -- like Kazakhstan -- won't without a fight. Unlike Ukraine, most of the others are not conveniently next to Europe and hence will be impractical for western nations to support.
After Ukraine falls, Moldova is next, and then the various -stans will be rolled up in quick succession. This will create a Soviet Union 2.0, which will be a net positive for Russia, and a mixed bag for the rest of the world. It'll likely be a net negative for Europe, which is why they're supporting Ukraine now.
If Putin ever gets tired of war, he seems to quicky recover and start again.