WWII in Europe ended not just with the fall of Berlin, but with the Marshall plan. If something like that happened after WWI, Europe would have been very different.

But enacting a Marshall plan requires a definite military defeat first. Else it's pacifying the aggressor again, with the same efficacy as in 1938.

Do you think Ukraine would accept this abdication? If the world gives up on Ukraine, I would not be surprised if they just said fuck it and sent a bunch of missiles into Moscow.

In terms of world peace, I fear the best we can hope for is a prolonged stalemate, or something unexpectedly changing in Russian politics. In the past, I might have hoped that Ukraine would trade invaded land for NATO membership, but it seems this is untenable for both Russia and Europe (e.g. Hungary).

Also, leaving a country to die would surely cause mass political unrest across Europe.

> With hindsight ww2 could have been avoided

With hindsight most of WW2 could have been avoided if UK/France invaded Germany while its army was busy in Poland. Even during the Sudeten crisis, though this would have probably required a soviet intervention which would have been problematic. Then again the German Army wasn’t that well prepared for an all-out war back in 1938 and might have been bogged down in Czechoslovakia similarly to how Russia is now stuck in Ukraine. Support for Hitler in Germany wasn’t that necessarily that strong prior to the conquest of France especially amongst the military leadership* so a coup wouldn’t have been out of the question. The Battle of France pretty much turned Hitler into a German Napoleon.

* mainly because they didn’t believe that a quick victory was an option and feared a repeat of WW2. They obviously wanted to win a war against France eventually.