Russia's Foreign Minister Sergei Lavrov has said that there can be "no mercy" for those behind the bombing that killed the daughter of a prominent ultranationalist intellectual at the weekend.
It comes on the same day that hundreds gathered for the Moscow funeral of Daria Dugina, who was killed in a car bombing that Russia blames on Ukraine.
"The investigation will hopefully be completed soon. According to the results of this investigation, there can be no mercy for those who organised, ordered and carried out (the bombing)," Mr Lavrov said at a press conference in Moscow.
Alexander Dugin, a vocal supporter of the invasion of Ukraine, is believed to have been the intended target of the attack that killed his 29-year-old daughter.
Ukraine denies any involvement.
Mourners, many carrying flowers, paid their respects to Ms Dugina at a hall in Moscow's Ostankino TV centre where her black-and-white portrait was displayed over an open casket.
Mr Dugin and his wife, both dressed in black, sat next to their daughter's coffin.
"She died for the people, for Russia, at the front. The front - it is here," Mr Dugin said at the start of the ceremony.
The parliamentary leaders of the three main pro-Kremlin parties spoke at the service, hailing Ms Dugina as a patriot.
They vowed that those who had ordered and carried out her murder would face justice.
Ms Dugina was killed on Saturday when a bomb placed in her car went off as she drove on a highway outside Moscow.
Russia says Ukrainian intelligence was behind the attack, a claim dismissed by Kyiv.
Mr Dugin, 60, gained prominence in the 1990s in the intellectual chaos that followed the break-up of the Soviet Union.
He had been an anti-communist dissident in the last years of Soviet rule.
A regular feature on Russian television, the heavily bearded intellectual with the air of a prophet claimed he had an ideological influence on Mr Putin.
