A non-signatory party of the Treaty on Nuclear Non-Proliferation, Pakistan is an influential member of the IAEA. In recent events, Pakistan has blocked an international treaty to limit fissile material, arguing that the "treaty would target Pakistan specifically". In the 20th century, Pakistan's nuclear deterrence program focused on countering India's nuclear ambitions in the region, and nuclear tests by India eventually led Pakistan to reciprocate to maintain a geopolitical balance as becoming a nuclear power. Currently, Pakistan maintains a policy of credible minimum deterrence, calling its program vital nuclear deterrence against foreign aggression.