According to a report by Stockholm International Peace Research Institute (SIPRI), the combined military stockpile of the world's nine nuclear-armed states rose from 9,380 to 9,620 in one year, excluding the warheads waiting to be dismantled.
US President Donald Trump accuses Russia of violating the 31-year-old nuclear weapons agreement which prohibits Washington and Moscow from possessing, producing or test-flying a ground-launched cruise missile with a range of 300 to 3,400 miles.