N. Korea: We've OK'd Nuclear Strike on US Army warns that 'moment of explosion' is near By John Johnson, Newser Staff Suggested by BradCS Posted Apr 3, 2013 7:44 PM CDT 130 comments Comments In this file photo, North Korean leader Kim Jong Un, second from left, walks during his visit to a military unit at an undisclosed location in North Korea. (AP Photo/KCNA via KNS, File) (Newser) – Last month, North Korea threatened to hit the US with a pre-emptive nuclear strike. (It even had a video of what it might look like.) Today, Pyongyang managed to up the ante. The North Korean army warned that it had been given the green light to launch said strike against America, reports AFP and al-Jazeera. "The moment of explosion is approaching fast," said the military statement, adding that it could happen "today or tomorrow." The announcement came just after the US said it was moving an advanced missile-defense system to Guam to protect US bases in the Pacific, with defense chief Chuck Hagel saying the Pentagon had no choice but to take the North's rhetoric seriously. In its own statement, Pyongyang promised to use "cutting-edge smaller, lighter and diversified nuclear strike means." One hopeful note: Reuters reports that the North is years away from "significant atom bomb material," even if it fires up its dormant reactor as quickly as possible.