Yes, the paradigm shift is fully displayed in Ukraine. It seems that Western military planners are still slow to adapt. Maybe ours too. This is the age of hypersonics and drones. All those fancy aircrafts can fly but will have no airbase to return to once the shooting starts.

Radar signal sesnor.

Modern aircraft has UV or IR sensor to detect and track heat from IR missile exhaust. Old school ones like in Topgun uses mark one eyeball to detect heat seeking missiles.