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Caption:Funeral assistants carry the coffin of Russian opposition leader Boris Nemtsov before a farewell ceremony in Moscow on March 3, 2015. Russia vowed on March 2 to find the killers of outspoken opposition leader Boris Nemtsov as fresh details emerged about the most shocking political assassination during Vladimir Putin's rule. Nemtsov's body will lie in state on March 3 at the Andrei Sakharov rights centre in Moscow, followed by his burial at the city's Troekurovskoye cemetery. AFP PHOTO / ALEXANDER UTKIN (Photo credit should read ALEXANDER UTKIN/AFP/Getty Images)
Caption:Funeral assistants carry the coffin of Russian opposition leader Boris Nemtsov before a farewell ceremony in Moscow on March 3, 2015. Russia vowed on March 2 to find the killers of outspoken opposition leader Boris Nemtsov as fresh details emerged about the most shocking political assassination during Vladimir Putin's rule. Nemtsov's body will lie in state on March 3 at the Andrei Sakharov rights centre in Moscow, followed by his burial at the city's Troekurovskoye cemetery. AFP PHOTO / ALEXANDER UTKIN (Photo credit should read ALEXANDER UTKIN/AFP/Getty Images)

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    Russia opposition leader Boris Nemtsov laid to rest

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Russia opposition leader Boris Nemtsov laid to rest

Long-time Putin critic Boris Nemtsov was laid to rest after being gunned down and killed by unknown attackers in Moscow.

Russia opposition leader Boris Nemtsov laid to rest

Long-time Putin critic Boris Nemtsov was laid to rest after being gunned down and killed by unknown attackers in Moscow.