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Alexei Navalny was arrested Sunday after arriving back in Russia from Germany, where he had been recovering from nerve agent poisoning. A judge ordered that he remain in custody for 30 days.
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Hackers invaded computer systems at the departments of Treasury, Commerce and Homeland Security as far back as the spring, according to the government and media reports.
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The National Security Agency, as well as its counterparts in Britain and Canada, say they're seeing persistent attempts to hack into organizations working on a potential vaccine.