The Stockholm-based arms-control institute, Sipri, released a report on Monday (4 June) claiming nuclear warheads are fewer in number but are increasingly more sophisticated. The United States, Russia, the United Kingdom, France, China, India, Pakistan and Israel collectively have around 4,400 operational nuclear weapons. An operational nuclear weapon is one where a warhead is placed on a missile or located on an active military base, for instance. Some 2,000 are kept in a state of high operational alert, says Sipri. Source: Naval Open Source, http://upload.wikimedia.org/
