What countries had nuclear weapons in the Cold War?
Nine countries possess nuclear weapons: the United States, Russia, France, China, the United Kingdom, Pakistan, India, Israel, and North Korea. Some countries first developed nuclear weapons in the context of the Cold War, as the United States and the Soviet Union jockeyed for influence.
Which European countries have nukes?
Statistics and force configuration
Who are the 5 countries that have nuclear weapons?
Since 1970, 191 states including the US, Russia, UK, France and China have joined the NPT. These five countries are called nuclear-weapon states – and are allowed to have weapons because they built and tested a nuclear explosive device before the treaty came into effect on 1 January 1967.
Are there any countries that have reduced their nuclear arsenal?
While France has reduced its arsenal unilaterally, and the United Kingdom announced ambitious reductions to its arsenal in 2010, both states plan to maintain a credible nuclear deterrent for the foreseeable future.  China is the only NWS that appears to be increasing its nuclear stockpile, albeit slowly. 
How many countries have signed the Non-Proliferation Treaty?
This is because of something called the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) – an agreement which aims to prevent the spread of nuclear weapons and promote disarmament. Since 1970, 191 states including the US, Russia, UK, France and China have joined the NPT.
What was the first treaty to ban nuclear weapons?
 On 7 July 2017, a United Nations conference adopted the Treaty on the Prohibition of Nuclear Weapons, the first international treaty to prohibit nuclear weapons comprehensively, including banning the development, acquisition, test, use, threat of use and possession of nuclear weapons.