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©ANATOLY MALTSEV/EPA/MAXPPP - epa07392611 Opposition supporters take part in a memorial meeting for Boris Nemtsov to mark the fourth anniversary of his murder, in St. Petersburg, Russia, 24 February 2019. Boris Nemtsov, a liberal opposition leader and sharp critic of Russian president Vladimir Putin, was killed on 27 February 2015 by a group of Chechen military servicemen. Five were arrested, one was killed during detention, and one of the organizers of the crime is still wanted.