Explanation
Apart from the 5 officially recognized nuclear-weapon states under the NPT, some other countries are also known to possess nuclear weapons:
5 recognized by NPT: USA, Russia, China, UK, France
4 outside NPT recognition/with disputed status: India, Pakistan, North Korea, Israel
Total countries believed to have nuclear weapons: about 9.
other information
India – Conducted nuclear tests in 1974 and 1998.
Pakistan – Conducted nuclear tests in 1998.
North Korea – Conducted nuclear tests starting in 2006.
Israel – Widely believed to possess nuclear weapons, but it has never officially confirmed this.
