A portrait of Kremlin critic Boris Nemtsov and flowers are pictured at the site where he was killed on February 27, with St. Basil's Cathedral seen in the background, at the Great Moskvoretsky Bridge in central Moscow March 6, 2015. Nemtsov, 55, was shot dead meters from the Kremlin as he was walking home. REUTERS/Maxim Shemetov (RUSSIA - Tags: POLITICS CRIME LAW)