India on Thursday signed a US$7 billion order for 97 domestically designed and built Tejas fighter jets as its air force retires its outgoing Russian MiG-21 jets after decades of use.The first Tejas jets – meaning “brilliance” in Hindi – were commissioned into the air force in 2016, with the latest commission for the fourth-generation version of the fighter, Mk-1A.India, one of the world’s largest arms importers, has made the modernisation of its forces a top priority, and made repeated pushes...