I hate to invoke Godwin's law, but if Hitler was stopped at Czechoslovakia, and then Poland, maybe we wouldn't have WWII. But the world didn't care back then, and apparently it still doesn't.
Most of them have not ended in a world war.
We do not need to retake Karelia for Finland to prevent a world war. We no not need to take Gibraltar for Spain to prevent a world war. What about Northern Ireland? How about retaking Northern Cyprus for Greece?
I'm not approving of the annexations, but at some point the war needs to stop.
In other words, I believe you're just repeating Russian propaganda.
historically, two out of the last three have ended in a world war. The only exception being the Balkan wars of the 1990s when the collective West did choose to heavily intervene.
Nonetheless, I see it as a good thing for the EU - maybe we'll finally stop being a "sending prayers" pussies, develop weapons, stop depending in 100% on NATO, and grow some balls.
Also, we knew Trump would do this because Trump is an ally of Putin, as (it seems) are you.
Not a single person I know is willing to sacrifice their livelihood to defend Ukraine's borders. What an absurd idea.