"Hey there's these military bases from which aircrafts start which bomb civilians since years and now even target hospitals or children hospitals, can we attack these aircrafts and their bases?" - No, Putin could be angry
This sucks so much. Russia would have lost probably way more planes already and need to station them somewhere else which would also give Ukraine more time to prepare for every attack.
It's pretty much all Russia still has which gives Ukraine so much trouble every single day. Sea fleets are no big problem for Ukraine anymore (from them attacking Ukraine) and ground forces are also not much doing anymore with their shitty equipment but those hundreds of pretty decent warplanes with sadly good missiles are a big deal. They attack civilian infrastructure, they probably also hit important Ukrainian bases/bunkers again and again (even though we almost never hear from that) and they bomb the frontline with soldiers fighting with their life to defend their country/woman/children.
One plane is probably worth more than 50 tanks and as useful as 100 Russian tanks. If you want to win against Putin you need to destroy these. This will blow up Russia's costs for this war and it takes a lot of time to replace destroyed warplanes. You don't just build 10 new ones every day...
