"Stores and businesses in North Korea have mostly resumed production, " said the official, who is in regular contact with North Korean counterparts.

WSJ: Trade Binds North Korea to China

The handful of aluminium-bodied cars in production have mostly been low-volume luxury models, such as the Honda NSX, the Audi A8 and the Jaguar XJ.

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And consumer electronics production has mostly shifted abroad.

ECONOMIST: Creeping protection | The