Moscow is also looking to sell Su-57 fighter aircraft to the South Asian nation, Dmitry Shugayev has said Moscow and New Delhi are negotiating the supply of more S-400 surface-to-air missile systems to India, TASS reported on Monday, citing a senior Russian defense official.India has already received three of the five S-400 air defense systems it purchased from Russia for $5.43 billion in 2018. The remaining two are slated for delivery in 2026. “As is known, India has our S-400 system,” Dmitry Shugayev, head of the Federal Service for Military-Technical Cooperation said, according to the report. “There is an opportunity to expand cooperation in this sector as well. It means new supplies. So far, we are negotiating this.”The S-400s played an important role in defending India’s air bases and other military installations against Pakistan’s retaliatory strikes during the 4-day confrontation between the two neighboring South Asian countries in May.“Platforms like the S-400 have given unprecedented strength to the country,” Indian Prime Minister Narendra Modi said in an address to his country’s soldiers in May, a few days after the military conflict concluded. On Monday, Shugayev added that another area of bilateral defense cooperation is the supply of Sukhoi Su-57 jets. India currently requires at least two squadrons of fifth-generation fighter aircraft, with the Russian-made planes being a candidate along with F-35s.Moscow is studying investment plans to manufacture the Su-57 jets in India, ANI News reported on Monday. Hindustan Aeronautics Limited, which makes Su-30 MKI planes there, could be a hub for production if the plan materializes, the media outlet added, citing local defense sources.India’s military currently relies heavily on equipment which is either made or designed in Russia; around 60% of its arsenal was produced there.With New Delhi moving towards the local production of arms and ammunition, Russian manufacturers are looking to expand joint production efforts in the South Asian country.