By Guy Faulconbridge LONDON (Reuters) -Alexei Navalny, Russia’s most prominent opposition leader, has been abruptly moved from the prison where he was serving an 11-1/2 year sentence to a high-security penal colony farther from Moscow. Navalny earned admiration from the disparate opposition in 2021 for returning to Russia voluntarily in 2021 from Germany, where he had been treated for what Western laboratory tests showed was an attempt to poison him in Siberia with a Soviet-era nerve agent. Russia denies trying to kill him. His chief of staff Leonid Volkov said that when Navalny’s lawyer arriv…