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What a mysterious explosion tells us about Russia's 'doomsday weapon'

London and Moscow (CNN)An explosion. An abruptly-canceled village evacuation. Five dead nuclear experts. And a few traces of radioactive iodine in the air over the northern Norwegian coastline.These are the fingerprints of what appears to have been Russia's latest failed bid to test its Burevestnik missile, also known as Skyfall. It's claimed by its owner, Russian President Vladimir Putin, to have unlimited range and be able to outflank all US air defenses. But this month, it proved, for a Kremlin keen to emphasize its growing military muscle, yet another high-profile hiccup.It wouldn't be the first time that a test of the missile wasn't entirely successful, according to US officials.But what is Skyfall? In truth, analysts don't really kno ...