LogFAQs > #883988534

http://www.businessinsider.com/these-are-the-worlds-20-strongest-militaries-ranked-2016-4
http://www.cnn.com/2016/12/06/asia/japan-military-pearl-harbor-anniversary/index.html

either or should work okay, though the latter is better than the former i think. just because it's not really a by the numbers analysis. business insider has put Japan at 4th for years now. second link just has US officials outright saying that Japan's legit top tier. this one puts Japan down in 7th:

http://www.globalfirepower.com/countries-listing.asp

but i'm a bit more skeptical there due to how score's weighted.

either way, all that should be enough. if NK attacks the US, China and/or Japan will run through 'em. Japan would have plenty of reason to believe they're on the chopping block, China will want to keep the US out of their yard. if NK attacks Japan, China or Japan will do the job.

i did forget about South Korea too but i'd imagine they'd also attack in either scenario. NK is a lot of hot air because if they try anything in any one region, they've got two others breathing down their neck and they're all much stronger.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.