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NO EASY ANSWER ON N KOREA says Krauthammer

This is how you keep Kim Jong Il from proliferating. Make him understand that his survival would be hostage to the actions of whatever terror group he sold his weapons to. Any terrorist detonation would be assumed to have his address on it. The United States would then return postage. Automaticity of this kind concentrates the mind.

This policy has a hitch, however. It only works in a world where there is but a single rogue nuclear state. Once that club expands to two, the policy evaporates because a nuclear terror attack would no longer have a single automatic return address.

Which is another reason why keeping Iran from going nuclear is so important. With North Korea there is no going back. But Iran is not there yet. One rogue country is tolerable because it can be held accountable. Two rogue countries guarantees undeterrable and therefore inevitable nuclear terrorism.