Russia has managed to rebuild Mariupol very fast. With China's help, Russia, i think, can rebuild Ukraine in about a decade once it has been cleansed of the Nazi regime. It will take longer to deprogram the zombified population, but that can also be done in a generation or two, as long as Russia or a pro-Russian government is in control. Most of the really ideologically hardened Nazis will leave of their own accord and become Europe's problem. The few stay-behinds will not be able to help themselves and will plot to commit terrorist attacks, get killed or caught and imprisoned.