Sometimes portrayed as Russia's Paris Hilton, Sobchak, 35, is the daughter of Anatoly Sobchak - a former mayor of St. Petersburg and the man responsible for launching Putin into politics after he left the Russian intelligence organization, KGB.
"I am a candidate "against everyone". Some believe she is Putin's goddaughter, a claim that she has consistently denied. Her mother, Lyudmila Narusova, was a member of the upper house of the Russian parliament.
A Russian celebrity TV host shook up the country's political scene Wednesday by announcing her presidential bid, a move that would likely boost public interest in the race but could further fragment the nation's beleaguered opposition.
Sobchak - whose Instagram account often features photographs of her in designer clothes and has more than 5 million followers - now hosts a popular talk show on TV Dozhd, an independent online channel.
The Kremlin has said she is eligible to run in the election. Her apartment was raided in June 2012 by armed police on the eve of an opposition rally and she briefly dated Ilya Yashin, a well-known anti-government activist.
Liberal politician Dmitry Gudkov sounded more positive, saying if Sobchak runs a real campaign critical of the Kremlin that it could help encourage political competition and draw young voters into the polls.
The Bell outlet cited two sources as saying that Vitaly Shkliarov, a political consultant who worked on the Bernie Sanders campaign in the 2016 US presidential race will work on Sobchak's campaign. Russian media wrote that the Kremlin was in favor of a female presidential candidate to run against Putin in a bid to "liven up" the March 2018 presidential election.
Kolkata passengers fall ill on Tejas Express, rail food under scanner
But, they are still under observation of the doctors of the private hospital, where they were taken to. After couple of hours, more passengers complained of similar symptoms, it said.
"This is a loathsome Kremlin game that goes by the title of 'let's put a liberal laughing-stock up for the elections in order to distract attention, '" Navalny said.
Sobchak argues the ban on Aleksei Navalnii's nomination because of a conviction for embezzlement, a situation the opposition leader has repeatedly cited as politically motivated, should not lead to boycotting the presidential race.
But before she made the announcement, Mr Navalny warned Ms Sobchak on YouTube that she would only serve the Kremlin's goals by running for president.
Ms. Sobchak told the opposition-leaning TV broadcaster Rain she had told Mr. Putin in advance of her intention to run, adding it had seemed to her that he had not liked her decision.
Ksenia Sobchak, 35, announced her intention to become a candidate in March's election in a YouTube video, arguing that Russian Federation has grown exhausted of its current political elite and needs a change. The Kremlin spokesman explained that he was not at the meeting.
"Unfortunately, our Western partners, having divided the USSR's geopolitical legacy, were certain of their own incontestable righteousness having declared themselves the victors of the 'Cold War, '" said Putin.
She also sent a letter to the daily Vedomosti news site outlining her reasons for running against Putin, who is expected to confirm his candidacy at the Valdai conference October 19, where the Kremlin said he will make "an important announcement".