The global number of nuclear warheads dropped last year, though none of the nine nuclear powers showed any signs of giving up their atomic weapons, an arms watchdog said Monday. In an annual report, the Stockholm International Peace Research Institute said the United States, Russia, Britain, France, China, India, Pakistan, Israel and North Korea, together had about 15,395 nuclear weapons on Jan. 1 this year, down from 15,850 a year earlier.
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