
For more than half a century, China has seen North Korea as a dangerous irritant as much as an asset. It might be useful for keeping the United States off guard, and regarded as an essential buffer by the military establishment, but China would happily ditch it if there were a better option.
The North Korean regime has tended to be characterised as uniquely irrational and unpredictable. From its perspective, however, its behaviour makes eminent sense: in fact, its argument for developing a nuclear capability closely echoes the rationale of the great powers. It has no declared intent to launch a first strike, but as long as others have nuclear weapons, North Korea reasons they serve a deterrent function. The regime also argues, as others have, that there are associated benefits with civil nuclear power.