If we believe some of the news, the invasion effort looks poorly coordinated and very risky. There are some units stranded without fuel, some light mechanized units engaged big cities and got repelled, whereas others got destroyed on the roads without proper air cover.
Frankly, Russia has some very impressive military tech but the whole thing does not look well planned at all. It seems more like the product of a delusional leader and some incompetent high ranking officials. Getting into urban warfare, which is where this seems to be heading to will turn to big losses on his side. Reminds me of Croatia '91, but without the secession component. Jugoslav National Army threw shitloads of poorly motivated armor units and they got nowhere.