Well so CNN reports.
However really it is part of a game. North Korea has nuclear weapons. It has every means to hide any facilities it wishes underground. Can you ever trust a regime that lies as a matter of course, or one that imprisons young children as political prisoners? Frankly unless North Korea's exports can be monitored, or it can be open to full free inspection, it's just another dictatorship doing as it wishes. It should remain on the axis of evil - for the price of peace with North Korea is the slave state that it remains for most of its people.