[One potential sticking point in all this is verification. Analysts have long suggested that North Korea wants a nuclear arsenal as a deterrent to attacks, rather than as part of an offensive strategy to invade South Korea. To maintain its deterrent capability, the North would need only a few weapons and a rudimentary delivery system, and hiding such a small cache in the country's underdeveloped hinterland would not be difficult.] Verification is definitely a problem, ... But to reach a new agreement they need progress, and today's statement is progress. Jin Canrong