FILE - Leonid Volkov, chief of staff for the 2018 presidential election of Russian opposition leader Alexei Navalny, looks on, at the European Parliament in Strasbourg, eastern France, Dec. 15, 2021. Two people have been detained in Poland on suspicion of attacking Russian opposition activist Leonid Volkov, an ally of the late activist Alexei Navalny, Lithuanian President Gitanas Nauseda announced on Friday, April 19, 2024. (AP Photo/Jean-Francois Badias, File)