MOSCOW—Tears of joy ran down Lyubov Sobol’s face when news came through that Alexei Navalny had awakened after more than two weeks in a coma. The 32-year-old blond lawyer, who cultivates a nerdy look with her dark-rimmed glasses, spent a decade fighting Russia’s state corruption at Navalny’s side. His partial recovery doesn’t make her work any less dangerous.

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