HAL would be joining Russia's Sukhoi Corporation to co-design, co-develop, and manufacture 200-250 FGFA; each separately for its respective air force. Joint development and production by HAL for the Indian Air Force are estimated to cost Rs 135,000 crore ($30 billion) or around Rs 500 crore each. HAL's Chairman, Mr Ashok Nayak, told Business Line that the requirements for the Indian version were known but the work packages, that is, HAL's share in the design and development, were to be specified. “We would like to do as much as we can of the design aspect,” he said. Although the Russian side was testing a single-seater FGFA prototype for its air force, he explained that the Indian version would demand lot of work in new design as well as changes for what could be a two-seater for the IAF.