MOSCOW (AP) — Moving quickly to assign blame, Russia on Monday declared Ukrainian intelligence responsible for the brazen car bombing that killed the daughter of a leading right-wing Russian political thinker over the weekend. Ukraine denied involvement.

Darya Dugina, a 29-year-old commentator with a nationalist Russian TV channel, died when a remotely controlled explosive device planted in her SUV blew up on Saturday night as she was driving on the outskirts of Moscow, ripping the vehicle apart and killing her on the spot, authorities said.

Her father, Alexander Dugin, a philosopher, writer and political theorist who ardently supports Russian President Vladimir Putin’s decision to send troops into Ukraine, was widely believed to be the intended target. Russian media quoted witnesses as saying that the SUV belonged to Dugin and that he had decided at the last minute to travel in another vehicle.

Russia’s Federal Security Service, or FSB, the main successor to the KGB, said Dugina’s killing was “prepared and perpetrated by the Ukrainian special services.”

The FSB said a Ukrainian citizen, Natalya Vovk, carried out the killing and then fled to Estonia.

In Estonia, the prosecutor general’s office said in a statement carried by the Baltic News Services that it “has not received any requests or inquiries from the Russian authorities on this topic.”

The FSB said Vovk arrived in Russia in July with her 12-year-old daughter and rented an apartment in the building where Dugina lived in order to shadow her. It said that Vovk and her daughter were at a nationalist festival that Dugin and his daughter attended just before the killing.

The agency released video of the suspect from surveillance cameras at the border crossings and at the entrance to the Moscow apartment building.

The FSB said Vovk used a license plate for Ukraine’s Russian-backed separatist Donetsk region to enter Russia and a Kazakhstan plate in Moscow before switching to a Ukrainian one to cross into Estonia.

Ukraine’s presidential adviser Mykhailo Podolyak denied any Ukrainian involvement in the bombing. In a tweet, he dismissed the FSB claims as fiction, casting them as part of infighting between Russian security agencies.

In a letter extending condolences to Dugin and his wife, Putin denounced the “cruel and treacherous” killing and added that Dugina “honestly served people and the Fatherland, proving what it means to be a patriot of Russia with her deeds.” He posthumously awarded Dugina the Order of Courage, one of Russia’s highest medals.

Russian Foreign Minisry spokeswoman Maria Zakharov said Dugina’s killing reflected Kyiv’s reliance on “terrorism as an instrument of its criminal ideology.”

In a statement, Dugin described his daughter as a “rising star” who was “treacherously killed by enemies of Russia.”

“Our hearts are longing not just for revenge and retaliation. It would be too petty, not in Russia style,” Dugin wrote. “We need only victory.”

The car bombing, unusual for Moscow since the gang wars of the turbulent 1990s, triggered calls from Russian nationalists to respond by ramping up strikes on Ukraine.

Sergei Markov, a pro-Kremlin political analyst, argued that the perpetrators of Dugina’s killing might have hoped to encourage a split between those in the Russian elite who advocate a political compromise to end the hostilities in Ukraine and proponents of even tougher military action.

Dugin, dubbed “Putin’s brain” and “Putin’s Rasputin” by some in the West, has been a prominent proponent of the “Russian world” concept, a spiritual and political ideology that emphasizes traditional values, the restoration of Russia’s global influence and the unity of all ethnic Russians throughout the world.

Dugin helped popularize the “Novorossiya,” or “New Russia” concept that Russia used to justify the 2014 annexation of Ukraine’s Crimean Peninsula and its support of separatist rebels in eastern Ukraine. He has urged the Kremlin to step up its operations in Ukraine.

Dugin has also promoted authoritarian leadership in Russia and spoken with disdain of liberal Western values. He has been slapped with U.S. and European Union sanctions.

His daughter expressed similar views and had appeared as a commentator on the TV channel Tsargrad, where Dugin had served as chief editor.

Dugina herself was sanctioned by the U.S. in March for her work as chief editor of United World International, a website that Washington has described as a source of disinformation.

In an appearance on Russian television last week, Dugina called America “a zombie society” where people oppose Russia but cannot find it on a map.