“The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.”
― G.K. Chesterton
The Ukrainians have good morale because they're fighting to defend their country against a brutal oppressor. The Russians have bad morale because they don't know what they're doing in there in the first place, so they're only preoccupied with raping and pillaging and then going home with their loot. They don't give a shit about Putin's goals. Why would they love "what's behind them"? What's behind them is a corrupt, oppressive Hellhole ruled by a corrupt, oppressive *sshole.