North Korea - radiological evidence for nuke?

NY Times has article claiming US Air Force sources say they found radiological evidence for a nuclear explosion on overflights

Tentative, but indicative.

We may now find out whether Japan could literally build a nuke over a long weekend.
They ought to be able to, maybe one of two nations that could but haven't yet (Germany is the other).
Then there's the dozen or so who could make one in less than a year, one of which is certainly South Korea.
I won't get worried until Sweden and Canada start dusting off their contingency plans, they're definitely both capable.

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Sweden was fairly close at one point, actually; it came down in the end to a political decision on whether to commence with specific steps to a live test. I have it from good authority that one of the two metal half-spheres that were to surround the nuclear material was used as a kind of novelty ashtray by the project leader in his office for a good number of years afterwards.