In July, the Russian-manned cargo ship the Arctic Sea disappeared on its way to take timber from Finland to Algeria, sparking reports of the first incident of piracy in European waters since the days of the buccaneers. Experts and observers weighed in with their theories: the ship had been snatched in a commercial dispute; it was being used to run drugs; it was carrying something more precious — or dangerous — than timber. Since then, the Russian navy has found the ship, and the alleged hijackers who boarded it on July 24 have been charged with kidnapping and piracy. The...