(FILES) In this file photo taken on July 15, 2019 candidate to the Moscow City Duma Lyubov Sobol speaks during a rally against efforts to stop opposition candidates to register for elections to the Moscow City Duma in central Moscow. - Russian authorities on December 25, 2020 opened a criminal probe into an ally of opposition leader Alexei Navalny, Lyubov Sobol, alleging she threatened a person Navalny claimed took part in his poisoning, an associate said. Ivan Zhdanov, head of Navalny's Anti-Corruption Fund, wrote on Twitter that investigators launched a probe into trespassing "with the use of violence or a threat to use it" after Sobol rang the doorbell of the alleged Federal Security Service (FSB) agent. (Photo by Alexander NEMENOV / AFP)