History may one day record it as a stark irony – and let us hope an amusing one rather than the tragic kind – that on the very day that Barack Obama was sketching out to an adoring throng in Prague his vision of a post-nuclear world, North Korea launched a rocket that may one day give it the capacity to fire a nuclear warhead as far as 3,700 miles. This means, to get down to brass tacks, that it could hit Alaska.
