A man holds a poster of Kremlin critic Boris Nemtsov, who was shot dead on Friday night, during a march to commemorate him in central Moscow March 1, 2015. Holding placards declaring "I am not afraid", thousands of Russians marched in Moscow on Sunday in memory of Nemtsov, whose murder has widened a split in society that some say could threaten Russia's future. The sign reads, "He died for the future of Russia". [Photo/Agencies]