Everything Ukraine has “liberated” thus far was unoccupied and undefended.
Of course because the Russian fled.
If you believe that you are either blind or an idiot. There are plenty of videos of combat operations and the resulting dead Russians and destroyed Russian equipment.
Doesn't look like it was "unoccupied and undefended" until the Ukrainian artillery and ground attacks destroyed the Russian vehicles and killed a number of Russian soldiers.
Maybe you can ask the Russian POWs from the tank crew what they felt about the whole experience.
Not if you look at some of the battlefield films where the Russians got their assets kicked in.