The 30-year-old was killed by a car bomb on the outskirts of Moscow on Saturday evening. She was the daughter of the ultranationalist Russian political philosopher Aleksander Dugin. Many believe that Mr Dugin has been instrumental in shaping the Kremlin’s narrative on Ukraine.
The National Republican Army, a previously unknown organisation, has now claimed it carried out the bombing in a statement.
Describing themselves as “partisans and fighters”, they wrote: “We declare President Putin a usurper of power and a war criminal.
“He has amended the Constitution and unleashed a fratricidal war between the Slavic peoples and sent Russian soldiers to certain and senseless death.
“Poverty and coffins for some, palaces for others.
“We believe that disenfranchised people have the right to rebel against tyrants.
“Putin will be deposed and destroyed by us!’
The rebels said their goal was to stop the destruction of Russia and its neighbours and to put an end to the pilfering of national wealth by Kremlin elites.
They promised a campaign of terror against all state officials who continue to serve the Putin administration.
They concluded: “We declare officials of the Government of the Russian Federation and regional administrations to be accomplices of the usurper.
“Those who do not resist their powers will be destroyed by us.”
A former Russian MP and anti-Putin activist described the attack on Ms Dugina as a “momentous event”.
The Kursk region borders Ukraine and has seen numerous sabotage attacks.
Saboteurs also targeted a section of the railway near Moscow and succeeded in damaging equipment, as well as bringing rail traffic to a temporary halt.
Alexey Golobutsky, a Ukrainian political expert, claimed the Moscow sabotage was almost certainly carried out by Russian partisans.
He said: “The actions of the unknown are not similar to the work of the Ukrainian special services.
“The most likely option is the activity of the Russian partisan movement, which is gaining momentum in the Russian Federation.”