Source : NEW INDIAN EXPRESS NEWS
Nine countries currently either say they have nuclear weapons or are believed to possess them.
The first to have nuclear arms were the five original nuclear weapons states — the United States, Russia, China, France and the United Kingdom.
All five are signatories to the Nuclear Nonproliferation Treaty, which commits countries that don’t have nuclear arms not to build or obtain them, and those that do to “pursue negotiations in good faith” aimed at nuclear disarmament.
Rivals India and Pakistan, which haven’t signed the NPT, have built up their nuclear arsenals over the years. India was the first to conduct a nuclear test in 1974, followed by another in 1998. Pakistan followed with its own nuclear tests just a few weeks later.
SOURCE :- NEW INDIAN EXPRESS