The Korean nations are technically still at war North Korea has carried out what appears to be its largest ever nuclear test, sparking global indignation. This is the country's fifth test. Why are the North Koreans doing it, and why is it important? Why now? Well, there have been some reasons given by the North Koreans themselves - and then there are some that need to be read between the lines: Officially, it was a demonstration of the "toughest will" of the Korean people to show they can retaliate to an attack by enemies. It was also a show against the "racket of threat and sanctions" that

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