For this reason, most countries signed the Partial Test Ban Treaty of 1963, which banned all nuclear weapons testing save for that done underground. This later expanded into the Comprehensive ...

Note: Since nuclear weapons programs are shrouded in secrecy ... led by shadowy military figure Mohsen Fakhrizadeh. All five legally recognized nuclear weapon states - China, France, Russia ...

Russia and the United States are by far the world's biggest nuclear powers, with about 88% of all nuclear weapons, followed by China, France, Britain, India, Pakistan, Israel and North Korea ...