Weird Giant Spiral Seen in Sky over Norway

[Bill]

Russia essentially confirms this was the failure of the third stage of a bulava missle, high above the atmosphere.

http://io9.com/5422979/norway-light-...ays-scientist-[updated]

As for why the perfect spiral shape was created:

McDowell says the shape suggests the failure occurred well above the atmosphere. If it had occurred at lower altitudes, atmospheric drag would have caused the missile to fall quickly to Earth, creating a downward-pointing corkscrew pattern whose contrails would have been blown "this way and that" by wind, he told New Scientist.
The Bulava missile has three stages that fire in succession as it climbs up in altitude. "Probably what happened is that stages 1 and 2 did just fine and were discarded in turn, and then stage 3 started burning and almost immediately went wrong," McDowell says.
He says the third stage's nozzle, which directs the rocket's exhaust plume, may have fallen off or been punctured, causing the exhaust to come out sideways instead of out the back. "The sideways thrust sends the rocket into a spin, spewing flame as it goes," he says.
"If thrust was terminated right away, then you wouldn't see the spiral," he continues. "The unusual thing this time is that the missile was allowed to carry on firing for a bit after it went wrong."

UPDATE: Jonathan McDowell writes in to say:

The Russians did send out a 'notice to mariners' in advance warning of a rocket launch, and they have now (Dec 10) admitted that there was a launch of the Bulava and that the third stage failed. Hope that answers some of the comments on your page.