It is all about advanced avionics like ability to jam enemy radar and communications systems , while you attack their assets with satellite guided precise ammunitions even flying low at night. Ability to communicate and coordinate with other ground based and airborne assets like (AWACS). Ability to pickup and attack enemy fighters before they get into close or visual range (BVR) etc.. all integrated into a stable proven fighter aircraft. Dogfights are a thing of the past or very unlikely . In my opinion SU30MKI is good platform for deep strike , nuke delivery may be with Kh-55s etc.. but I think India is looking for 126 aircrafts to replace mig 21s so I think cheaper but modern is something India will go for.
