Even if it's true that those are indeed Russian convoys and that they have been abandoned, I still think the Russians win. It's a numbers game, man. Russia has a larger population, which means a larger military, which should mean more engineers that produce more vehicles, and so convoys and artillery can be easily replaced. Also, more people means more taxes, and so the Rus gov't can purchase more artillery and other equipment from foreign countries if they want (or hire mercenaries if they're desperate).
By extension, since Ukies have a lower total population, their pro military is smaller, and so they have to compensate with militia. I don't think Ukies are going to get steamrolled, though. They're the defending force, living inside cities with a ton of buildings, which is a pretty solid advantage on the ground; it means you get to take cover first.
I think Ukrainian militias are smart enough to "play Taliban", meaning they'll try hiding behind their buildings while shooting and throwing molotovs at the enemy until they give up. However, I still think their morale is poor, and so if their buildings are shelled by light artillery or other missiles, they'll run. So, if, by some chance, the Ukrainians manage to make Russians abandon their artillery, that's a big win.
But to me, Russians win, simply because of numbers.