Kim Jong Un urged North Korea to mass-produce nuclear warheads and missiles in a defiant New Year message Monday suggesting he would continue to accelerate a rogue weapons program that has sent international tensions soaring. A former top US military officer warned on Sunday that the US is now closer than it has ever been to a nuclear war with North Korea, with little prospect of a diplomatic solution. Mike Mullen, a former chairman of the US joint chiefs of staff, attributed the rising danger to Donald Trump’s “incredibly disruptive” presidency. Trump infamously vowed in August to meet the North Korea with “fire and fury,” prompting Pyongyang’s threat to launch a missile at the US island territory of Guam.