Actually, in contemporary parlance it would be appeasement. Ukraine gave Russia a bloody nose, and giving up territories or even negotiating as suggested by Musk is called "appeasement":
https://www.washingtonpost.com/technology/2022/10/12/musk-tw...
"Musk appeasement of Putin and China stokes fears of new Twitter policies"
Since the beginning of the war, there are literally hundreds of similar examples. Not calling it appeasement would earn you the title of "Russian asset".