Russia's main opposition leader, Alexei Navalny, was taken from prison to hospital to be treated for what the authorities called an allergic reaction but supporters said may have been poisoning. He was later returned to prison, where he is in custody for organising an illegal protest, according to the Kremlin. More than 1,000 people were arrested at a demonstration in Moscow demanding that independent candidates be allowed to stand in a citywide election. More protests are planned.
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