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MOSCOW, RUSSIA - MARCH 01: People march in memory of Russian opposition leader and former Deputy Prime Minister Boris Nemtsov on March 01, 2015 in central Moscow, Russia. Nemtsov was murdered on Bolshoi Moskvoretsky bridge near St. Basil cathedral just few steps from the Kremlin on February 27. Nemtsov, a fierce critic of President Vladimir Putin, was shot dead ahead of a major opposition rally this weekend. (Photo by Oleg Nikishin/Epsilon/Getty Images)

MOSCOW, RUSSIA - MARCH 01:  People march in memory of Russian opposition leader and former Deputy Prime Minister Boris Nemtsov on March 01, 2015 in central Moscow, Russia.   Nemtsov was murdered on Bolshoi Moskvoretsky bridge near St. Basil cathedral just few steps from the Kremlin on February 27.  Nemtsov, a fierce critic of President Vladimir Putin, was shot dead ahead of a major opposition rally this weekend. (Photo by Oleg Nikishin/Epsilon/Getty Images)