Lit candles are placed on the ground as people gather to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov




A visitor holds flowers and a book "Confessions of the Rebel" by Russian leading opposition figure Boris Nemtsov while waiting to attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov





Lit candles are placed on the ground as people gather to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov





People place lit candles on the ground as they gather to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





People place lit candles on the ground as they gather to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





People stand in line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov, as vehicles drive by, in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





Mourners surround a coffin as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Dina Eidman (L), mother of Russian leading opposition figure Boris Nemtsov, looks on near the coffin during a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





Mourners, including Dina Eidman (3rd L, front), mother of Russian leading opposition figure Boris Nemtsov, and Mikhail Kasyanov (C, back), an opposition leader and former Russian prime minister, attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mikhail Kasyanov (R), an opposition leader and former Russian prime minister, attends a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Boris Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Zmeyev





Mourners, including Dina Eidman (3rd L, front), mother of Russian leading opposition figure Boris Nemtsov, and Mikhail Kasyanov (C, back), an opposition leader and former Russian prime minister, attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





People stand in line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov, with vehicles driving nearby, in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





Mourners, including Dina Eidman (3rd L, front), mother of Russian leading opposition figure Boris Nemtsov, attend a memorial service before the funeral of Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners, including Dina Eidman (L, front), mother of Russian leading opposition figure Boris Nemtsov, and Mikhail Kasyanov (L, 2nd row), an opposition leader and Russian former Prime Minister, attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin.REUTERS/Maxim Zmeyev





Mourners surround the coffin during a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





People gather to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Boris Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov






Mourners, including Dina Eidman (L), mother of Russian leading opposition figure Boris Nemtsov, Mikhail Kasyanov (R), an opposition leader and Russian former Prime Minister, and relatives and acquaintances, surround a coffin as they attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





People surround the coffin as they attend a memorial service before the funeral of Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners, including Mikhail Kasyanov (R, front), an opposition leader and Russian former Prime Minister, comfort each other as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners, including Dina Eidman (L), mother of Russian leading opposition figure Boris Nemtsov, and relatives and acquaintances, surround a coffin as they attend a memorial service before the funeral of Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





People stand in line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov, as vehicles drive by, in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





People stand in line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov, with vehicles driving nearby, in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





People stand in line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov, as vehicles drive by, in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





People stand in a line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Boris Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov





Mourners, including Mikhail Kasyanov (R, front), an opposition leader and Russian former Prime Minister, comfort each other as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners surround a coffin as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





Mourners surround a coffin as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners surround the coffin as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





Mourners surround a coffin as they attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Zmeyev





People arrive to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov





People stand in a line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Boris Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov





People stand in a line to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Several hundred Russians, many carrying red carnations, queued on Tuesday to pay their respects to Boris Nemtsov, the Kremlin critic whose murder last week showed the hazards of speaking out against Russian President Vladimir Putin. REUTERS/Maxim Shemetov





A man reacts as he waits to attend a memorial service before the funeral of Russian leading opposition figure Boris Nemtsov in Moscow, March 3, 2015. Nemtsov's girlfriend has broken her public silence on the murder of the Russian opposition activist, saying she did not see the killer who gunned him down as they strolled across a bridge near the Kremlin. Anna Duritskaya, who is 23 or 24, said she had been under constant guard since the murder and would probably be unable to attend Nemtsov's funeral on Tuesday. REUTERS/Maxim Shemetov