Vice-president Dick Cheney stepped up America's war of words with North Korea yesterday by calling it a police state run by an irresponsible leader indifferent to the fate of his malnourished people.His words came just 48 hours after the Pentagon announced that it was sending 15 F-117A Nighthawk stealth fighter-bombers to South Korea, a US ally, for an undetermined period. The aircraft crews, trained to seek out targets with precision weapons, needed to familiarise themselves with the Korean terrain, the air force said. Speaking to CNN in an interview broadcast last night, Mr Cheney described North Korea's leader, Kim Jong...