RusNano State Corporation CEO Anatoly Chubais (C) arrives to attend a farewell ceremony to the slain opposition leader Boris Nemtsov 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 / DMITRY SEREBRYAKOV