After a hacked US election covered in Russian fingerprints, it's easy to assume that Friday's megaleak of emails from France's president-elect Emmanuel Macron was the Kremlin's work, too. Russia, after all, has the motive, the means, and a very fresh track record of meddling in Western elections to sabotage center-left candidates. But this latest breach, for now, lacks conclusive fingerprints-and what few clues there are have only added to the confusion.

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