The surface-to-air missile system was highly effective during the recent military standoff against Pakistan, Amar Preet Singh has said The Russian-made S-400 surface-to-air missile system has been a “gamechanger” for New Delhi, Indian Air Force (IAF) chief Amar Preet Singh has said. Addressing a gathering on Saturday, Singh said the Indian armed forces had shot down five Pakistani jets and one airborne early warning and control (AEW&C) aircraft during strikes on its neighbor as part of ‘