Jailed Russian dissidents refuse to abandon the fight as wives take up the mantle
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Alexei Navalny died in prison, the latest opposition figure to pay the ultimate price for dissent in Putin's Russia
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Vladimir Kara-Murza, another jailed activist, refuses to abandon the fight despite a 25-year sentence
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Both Navalny and Kara-Murza returned to Russia knowing the risks but feeling they had to take a stand
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Their wives have taken up the mantle, speaking out despite intimidation about their husbands' cases
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Opposition activists urge supporters not to despair but prepare for the moment "when the regime shows cracks"