Nuclear weapons debate
After the bombings of Hiroshima and Nagasaki, the world’s nuclear weapons stockpiles grew, and nuclear weapons have been detonated on over two thousand occasions for testing and demonstration purposes. Countries known to have detonated nuclear weapons—and that acknowledge possessing such weapons—are (chronologically): the United States, the Soviet Union (succeeded as a nuclear power by Russia), the United Kingdom, France, the People's Republic of China, India, Pakistan, and North Korea.
Nuclear-weapon-free zone
The UK, France, and the USA share a nuclear umbrella with the 25 other members of NATO, and the 6 European Union states not part of NATO (Austria, Cyprus, Ireland, Malta, Sweden, Finland) are part of the EU's Common Security and Defence Policy.