I am not a military expert. I am sure there are others on this board that could explain this better than me. I will try.
The Russian air force sucks.
They do not have nearly the same amount of training and support that the USAF/Marines/Navy pilots have. They have some good equipment. They do not spend enough hours training how to effectively use it.
They fired 300 +/- missills into Ukraine. They needed to follow that with fixed wing airstrikes to destroy the remaining mobile antiaircraft units. They did not. So, their aircraft will continue to get picked off one at a time. They should have established air superiority. They did not.
Any FReeper with air defense experience please feel free to correct anything I am wrong about.
The Russian armed forces have failed even elementary tests for military training, cohesion, and planning.
Figures that a member of the Air Force would not understand ground combat realities...:-)
Ukraine is a little bit different from Iraq per quality and number of AA units. I think they are mostly done though.