It is postulated that Pakistan's crash programme arose in 1970 and mass acceleration took place following the India's nuclear test in 1974. It also resulted in Pakistan pursuing similar ambitions, resulting in the May 1998 testings of five nuclear devices by India and six as a response by Pakistan, opening a new era in their rivalry. Pakistan, along with Israel and India, is three of the original states that have restrained itself from being party of the NPT and CTBT which it considers an encroachment on its right to defend itself.