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poor inter-service coordination means Russian air force chiefs are not confident that their planes wouldn't be shot down by their own troops
There's quite a few threads on various platforms that suggest the strange way they've conducted the war means that the Russian military has no capability (at the moment) for close air support or, conversely, knowing which planes are overhead. It's made worse because lots of the soldiers have no idea where they are or what they're supposed to be doing.
Defence experts are puzzled by how few Russian combat aircraft are flying over Ukraine. Russia hasn't even attempted to gain air superiority. Possible explanations being floated are:
https://rusi.org/explore-our-research/publications/commentary/mysterious-case-missing-russian-air-force
https://www.reuters.com/world/europe/what-happened-russias-air-force-us-officials-experts-stumped-2022-03-01/?utm_source=digg&utm_medium=email