There has been very little mention of the still very large Russian Air Force attempting to help stem the Ukrainian advances. Have you heard any assessments of why?
The UKR forces have taking BUK MSAM embedded units with them, plus all the MANPAD, reportedly the RU Air Force are refusing to go anywhere near them - and have also lost several jets to friendly fire from their own troops.
And, of course, will intermingled units - they can’t ell friend from foe…