Since the NPT entered into force in 1970, three states that were not parties to the Treaty have conducted nuclear tests, namely India, Pakistan, and North Korea. North Korea had been a party to the NPT but withdrew in 2003. Israel is also widely known to have nuclear weapons, though it maintains a policy of deliberate ambiguity regarding this (has not acknowledged it), and is not known definitively to have conducted a nuclear test. Insidermonkey experts made a list of 10 countries that have weapons of mass destruction.
According to Bulletin of the Atomic Scientists Nuclear Notebook 2014, the total number of nuclear weapons worldwide is estimated at 10,144. South Africa developed nuclear weapons but then disassembled its arsenal before joining the NPT. Nations that are known or thought to have nuclear weapons are sometimes referred to informally as the nuclear club. These are only some odd the issues in the world we can think about these days, as there are much more, such as these 10 Biggest Health Problems in the World in 2016.