Nuclear North Korea?
Bring it on, says Robert Koehler (the Marmot) in FT on Korea-U.S. fissure:

I can think of lots of good that can come from a nuclear North Korea. For starters, money spent on an unusable nuclear arsenal (and protecting it from potential air strikes/nuclear first strikes) is money not spent on reconstructing North Korea’s infrastructure, so it’s just another nail in the DPRK’s coffin. A white elephant that glows in the dark, if you will. A nuclear North Korea could spark South Korea, Japan and Taiwan to go nuclear themselves, which would break the Russo-Chinese nuclear monopoly in East Asia and maybe, just maybe, encourage the United States to finally pull its forces out of Korea and Japan. Hey, if a nuclear North Korea would screw the Chinese and at the same time allow us to bring our troops home, maybe Washington’s got it all wrong with trying to block Pyongyang’s nuclear program. Rather it should subsidize it.

[See also The coming U.S. retreat from Asia by Patrick J. Buchanan.]