The French Defence Minister has cast doubts over the success of North Korea’s claimed nuclear test, saying that it produced an explosion so small that if indeed it was nuclear, it had been a failure.Michele Alliot-Marie said that although experts had not yet determined the precise cause of the explosion, French, American and other scientists had detected that it was of "relatively limited size." "In any case, if this was a nuclear explosion, it would be a case of a failed explosion," she said. Mme Alliot-Marie’s comments were the strongest yet from a senior Western policy-makers to suggest that the...