Russia is probably being a bit measured with its Sabre rattling as well since taking Ukraine on paper should not have been this difficult for them

I wouldn't take too much credit from them. They know all eyes are on them right now and likely don't want to show off every tool in their arsenal. They are probably not operating anywhere near their peak just so they have aces left in case things do escalate.

The whole war stinks from both sides on how its played out, so I wouldn't be surprised if its being drug out for some unseen objective either side is waiting on the other for.