Ukrainians fight like hell because they know they will be tortured if they surrender, or might even be killed if they try to.
The main reason to be nice to surrendering enemy combatants is that it motivates them to surrender. If you kill your enemy when he tries to surrender, your chances for victory diminish dramatically.
Ukraine wants victory. The Russia wants to inflict pain. Different goals, different means.
@Formfiller @LaFinlandia
No.
They went to die for Putin's ego.
Because they feel that they share his ego. In sending them to useless death, he shows he's a strong leader – as the soldiers want. They are glad to be part of their Strong Leader's plans. That makes them feel strong.
Remember, the Russia has not started sending conscripts to the front yet. All soldiers are there of their own choice. Mostly for money, but also for their country finally doing what they want it to do: Bruteness.