Air defense will soon become an economic impossibility. It is all offense and target intelligence from here on out for the rest of future history. Ukraine is making long range drones which cost 500 Euros to build. They're made of laser cut balsa wood and reinforced polystyrene. They pack just 3kg of explosives. Maybe they get lucky and make it all the way to their target and make a small boom, but if instead they eat a missile from a S-300, well that is a million dollar victory right there.
@Infoseepage so, going underground is a defence tactic to be employed in the future?
I've been told that I have a submariner's disposition regarding open air, so I'm already conditioned to live without seeing sunlight and breathing fresh air...