What is S-125 Neva/Pechora legacy air defence system that crushed Pakistan's air invasion?

Today, the Directors General of Operations from the Army, Air Force, and Navy held a press conference to inform the citizens about the country's air defense systems, which successfully thwarted Pakistan's air invasion following India's launch of Operation Sindoor as a response to the terrorist attack in Pahalgam. Director General of Air Operations, A.K. Bharti, emphasised that India’s air defense systems serve as a formidable barrier, making it nearly impossible for the enemy to breach. He reflected on how the Indian forces have significantly minimise damage to both civilian and military infrastructure, despite relentless attacks from Pakistani forces. Bharti highlighted that India’s air defense system boasts a diverse array of multilayered sensors and weapon systems.

India