I think it's a little early to be declaring a Russian defeat.Wouldn't be the first military to learn the wrong lessons from their most current history...
Is the Russian Air Force Actually Incapable of Complex Air Operations?
More than a week into the Russian invasion of Ukraine, the Russian Air Force has yet to commence large-scale operations. Inactivity in the first few days could be ascribed to various factors, but the continued absence of major air operations now raises serious capability questions.rusi.org