AESA "radars are under development and could possibly be retrofitted into existing MiG-35's," Sim Tack, the chief military analyst at Force Analysis and a global fellow at Stratfor, told Business Insider.
"In the future I would expect Russia to push those upgrades heavily if they have the budget for it though," Tack said, but "the lack of a phased array radar is a really significant drawback when it comes to operational performance."