Ukraine would turn into a neo-Nazi hellhole if Russia was successful in conquering and annexing it, since Russia is a neo-Nazi hellhole.
There's no way to describe Russia as anything else than that. The enforced leader worship, the hyper-militarisation of society complete with brainwashing kids at school, and the rapid, usually violent, quelling of any dissenting voice.
Ukraine will turn into exactly the opposite: a free and prosperous country part of the EU, adhering to the same values of freedom, democracy, the rule of law, and human rights. All the things that Russia hates.
There's a reason why Russian literature excels at depicting depression, grinding despair, and powerlessness against brutal and unjust authorities. Hopelessness is the most defining factor of the "Russkiy Mir".
Liza Alexandrova-Zorina on the psychosomatic symptoms of Russia. ‘They believe that nothing depends on them, and by them nothing can be changed.’
granta.com
It's also the clearest proof that Russian and Ukrainian are not "brotherly people", as the Ukrainians have never lost hope. That's why they wanted independence, that's why they fought against corruption in their government, and that's why they're fighting against Russia's invasion.
When you ask Russians what they hope for, they never say they hope for things to be better for themselves. They are only capable of hoping that things will be worse for others, so that the rest of the world can become as miserable as the Russians are. They have ceased thinking they can elevate themselves, and their only ambition is instead to drag other people down to their level.