I can't imagine that Russia has planned to take over such a large country.
It only makes sense if they only planned to bomb Ukraine into handing over Donetsk, Lukhansk, recognising the loss of Crimea, and agreeing not to join NATO.
From this perspective, it's hard for Russia to loose. A destroyed Ukraine won't fight for their lost territories and won't be accepted into the EU or NATO.
Don’t believe that for a moment. Crimea and parts of Donetsk etc already under their control and a limited incursion could have gained more territory at low risk.
Instead Russia faces huge economic penalties and stronger Ukraine-EU links are much more likely even if full membership doesn’t happen.
It only makes sense if they only planned to bomb Ukraine into handing over Donetsk, Lukhansk, recognising the loss of Crimea, and agreeing not to join NATO.
From this perspective, it's hard for Russia to loose. A destroyed Ukraine won't fight for their lost territories and won't be accepted into the EU or NATO.