It's not about territory, it's about destroying the Russian military and their equipment, once that is done taking the territory won't be a problem. Maybe heavy getting armor over the river to counter armor is not required, they would be used just to take ground and support infantry. However, the Russians have FPV drones too.
"Our FPV drones work very well. The Russians can no longer deliver BC (ammunition), evacuate people, etc. I saw with my own eyes one destruction of a car on the way back and one as they flew into the apartment. At the moment, Russia has lost all the tanks that were (in my sector) at a distance out to 25 km. FPV drones destroy any vehicle."