Europe also remembers how appeasement went for Europeans before wwii when another country though it would be cool to take over some neighbors.
I think you’ve advocating for Neville chamberlain’s appeasement policy.
That is a very short-term and one sided view of the conflict that has been on since at least 2014. BTW, we had peace agreements guaranteed by France and Germany before Russia invaded Ukraine.
It is naive to think Ukraine can be "taken over". The objective of the military operation is to prevent Ukraine from joining the NATO and US building nuclear capable bases right on Russia's border.
And nuclear capable bases? Haha As if Russia, China, the USA would have a problem launching ICBMs targeting anywhere. Not a real concern.
Ukraine is just a territorial land grab by Putin pining for an empire.