Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Russia Warns Navalny Supporters Not to Attend Sunday Protests Associated Press MOSCOW - Russian police have issued a strong warning against participating in protests planned for Sunday to call for the release of jailed opposition leader Alexei Navalny, the Kremlin's most prominent foe. The warning came amid detentions of Navalny associates and opposition journalists and a police plan to restrict movement Sunday in the center of Moscow. Navalny was arrested January 17 after flying back to Russia from Germany, where he had spent five months recovering from nerve-agent poisoning. His detention sparked nationwide protests one week ago in about 100 cities; nearly 4,000 people were reported arrested. The next demonstration in Moscow is planned for Lubyanka Square. The Federal Security Service, which Navalny claims arranged to have him poisoned with a Soviet-era nerve agent on behalf of the Kremlin, is headquartered in the square. The Russian government has denied a role in the 44-year-old's poisoning. .