The Russian opposition leader Aleksei A. Navalny has been moved to a prison north of the Arctic Circle but “is doing well,” his spokeswoman said on Monday, ending a 20-day mystery over his whereabouts that had many supporters fearing the worst.

“We have found Aleksei,” the spokeswoman, Kira Yarmysh, said on social media. “His lawyer saw him today.”

After an exhaustive, frantic search of Russia’s prison system after his Dec. 5 disappearance, Mr. Navalny’s exiled aides said on…

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