The concession apparently did win Bhabha's alignment. After the 1965 Indo-Pakistani war, pressure to build nuclear weapons intensified as the threat from Pakistan introduced new security concerns. Rather than using the renewed political debate to gain additional authorizations, Bhabha denied in an interview that he had received any new instructions from Shastri, saying: "The emergency changed nothing. Why should it?" Historians have interpreted Bhabha's comments as an indication that the constraint to building nuclear explosives was not policy, but unmet technological requirements.