 In the aftermath of the Indo-Pakistani War of 1965, he was involved in the investigations against Intelligence Bureau on allegations of ineptitude, and was reported to have submitted 65 reports to the investigation committee.When Research and Analysis Wing (RAW) was formed in 1968 as a splinter agency of IB, Nair became the deputy of Rameshwar Nath Kao, the founder director of the agency.During the Bangladesh Liberation War of 1971, he was in-charge of the operations there and his contributions in training the Mukti Bahini guerrillas are reported to have played a vital role in the successful liberation of Bangladesh.