What has surprised me so far is the poor all-around performance of the RU forces. Yes, the UA air force is nearing ineffectiveness, AD has been hit hard but the RU prep fires (MLRS/tube artillery) has not been near as extensive as I would have expected to support a ground invasion. And especially night fighting capabilities are poor. Most fighting is being done during daylight hours which helps level the field as UA are generally fighting from prepared defensive positions giving them a strength multiplier.
Compare to US, we live in the night and see dark as a significant combat multiplier.
We do know that RU committed forces so far is somewhere between 30-60k perhaps a bit more. Which raises the question on why they are not using more in the initial attack. One always wants a reserve, but with 150-200k around UA, the low number currently committed seems very odd even with limited objectives - not full occupation.