You cannot put radar on single-engine aircraft and twin-engine interceptors like Me-110 are not produced anymore
Attack helicopters are more promising, but Ukraine will need a few hundred of them to cover all directions
Russia is using attack helicopters to destroy Ukrainian drones
looks like the armor on them, designed to withstand .50cal, is enough to protect from debris
View: https://twitter.com/narrative_hole/status/1698687298265628795
But is a very expensive option to keep enough of them in the air
Plus Ukraine doesn't have such types of helicopters, Mi-24 is too big, and Apache or Tiger hardly will be shipped to Ukraine
Aim-7 Sparrow doesn't guide from the plane - it has semi-active radar homing system which means that lightning radar is placed on the plane and the missile has only a receiver with antenna. This approach saves a lot of power required for missile, but doesn't solve the main problem - the small footprint of drones on radar because only the engine can reflect something back. The rest of the drone is made from plastic and invisible to radar
So far S-300 which also has semi-active homing system wasn't very successful against cheap drones despite more powerful radar
It is nothing about morale, Russia is targeting mostly ammo storages within cities
Most of the damage you see in Western propaganda is the result of ground-to-air missiles losing their targets and hitting residential buildings
This is a price what Ukrainian pays for hiding launchers inside residential areas