Two Polish men have been arrested in Poland on suspicion of carrying out a "brutal" attack on exiled Russian political dissident Leonid Volkov, former chief of staff of the late Russian opposition leader Alexei Navalny.
The former chief of staff of the late Russian opposition leader Alexei Navalny was injured in a hammer attack outside his home in the Lithuanian capital Vilnius.
Russian authorities on Tuesday placed Oleksiy Arestovych, the former adviser to Ukraine's president, on their wanted list in connection with unspecified criminal charges.