George Lopez, a political science professor at the University of Notre Dame, is more emphatic. Even if the North had a small, deliverable weapon, he says, "I think most of the bets are that they do not have the capability to reliably reach a target."
"They don't seem to have the booster they need to get a workable weapon to land where they want it to," Lopez says.
"Could they build something, load it on an airplane and drop it over South Korea? Maybe, but it would pretty difficult, probably impossible."