"Anti-Russian sentiment has always been used as an electoral tool in the U.S.," Dmitry Peskov said.
Boris Nemtsov was shot several times in the back while walking home one night in 2015.
Zaur Dadayev was convicted of one of the most infamous political killings in Russia. His motive, however, still remains unclear.
Florida Senator Marco Rubio urged to remind the Kremlin that its critics are not silenced by death.
Nemtsov was the first governor of Nizhny Novgorod in 1997.
After almost two years the Boris Nemtsov case is going to court, but nobody knows who ordered the kill.
Former deputy prime minister Boris Nemtsov was shot and killed in central Moscow in February 2015.
Kremlin intimidation has caused a "brain drain" says the daughter of slain Putin critic Boris Nemtsov.
The mayor of Vilnius speaks to Newsweek about honouring Nemtsov.
Boris Nemtsov ally Kasyanov had a tasty surprise during dinner in Moscow.
A full interview with Alexander Bastrykin is to be published this week.
Having failed to knock out Ukraine with one big punch, Putin hopes to kill it with a thousand cuts.
The mayor of Kiev spoke with Nemtsov's daughter about the idea.
The mayor of Kiev is considering memorializing the murdered Russian opposition leader, but Moscow officials are reluctant to do the same.
Zhanna Nemtsova has not said where she has moved but confirmed reports that she left after receiving threats.
Supporters of the slain opposition leader have managed to communicate with Nemtsov's sources.
His description of the shooter does not match the investigation's main suspect.
Opposition figures have branded them "cowardly scum" and will press charges.
Amid reports of a Kremlin 'hit-list', prominent Russian dissidents no longer feel safe, even in Kensington.
Russian security services reportedly told the TV personality that she had become a target of Nemtsov's killers.
The human rights councillor said there were "reasonable ground" to suspect the men had been mistreated.
An opposition figure and friend of Boris Nemtsov called the official version of events a convenient lie.