Anastasia Vashukevich, who goes by Nastya Rybka on social media, was deported from Thailand on Thursday after pleading guilty to charges including soliciting prostitution, a Thai immigration official said.
Upon arriving in Moscow's Sheremetyevo Airport, Vashukevich was detained on suspicion of enticement into prostitution, state media RIA-Novosti reported.
Earlier Thursday, Vashukevich told CNN via text message that she was detained by a group of people "in civilian clothes" who did not introduce themselves or say why she was detained.
"They speak very rudely!" the text message said. "They say we must go with them for a couple of days somewhere!"
The Belarus-born model was part of a group led by author and free sex advocate Alexander Kirillov.
A self-described "sex coach," she was arrested in February 2018 in the Thai resort town of Pattaya while running so-called sex training sessions.
She was deported from Thailand after she and seven others unexpectedly pleaded guilty at the start of their trial to charges including soliciting prostitution and "forming and being a member of a secret society."
They were each sentenced to 18 months in jail but they were released to serve the remainder of their sentence on parole.
The eight members of the group were put on a commercial flight to Moscow from Bangkok on Thursday, Thail immigration chief Lt. General Surachate Hakparn said.
Vasukevich and another Belarusian group member would then transit home to Belarus, Hakparn said.
Kirillov's wife told Russian state media RIA-Novosti that Kirillov, Vashukevich and two others -- Andrei Zhezhko and Maria Zharkova -- were detained. "For how long and for what reason, we don't know," Christina Kirillov said.
"They can kill me here or in Russia," Vashukevich said at the time, speaking through the bars of the Bangkok Immigration Detention Center.
Claims of insider knowledge
Vashukevich claims to be the former mistress of Russian billionaire Oleg Deripaska, an ex-business associate of former Trump campaign chairman Paul Manafort.
She refused to name them but said she had photographs of one of the Americans and more than an hour of audio recordings.
Vashukevich and Kirillov told CNN they were afraid to reveal potentially compromising information in the event they are deported to Russia, where they are believed to have been previously based.
Deripaska -- who denies any affair -- is a subject of political intrigue in US political circles, owing to his links with Manafort.
The aluminum baron has close ties to Russian President Vladimir Putin and was recently included on a US Treasury Department list of Russian government officials and 96 oligarchs with a net worth of $1 billion or more.
When he was confronted by CNN in 2017, Deripaska called allegations that he may have been a back channel from the Kremlin to the Trump campaign "fake news."
Regarding his alleged relationship with Vashukevich, a representative for Deripaska told CNN last March: "This is clearly an attempt by Anastasia Vashukevich (aka Nastya Rybka) to politicize the accusations of the Thai police. There have been endless fictitious stories told by her, all serving to distract the public from real violations, including very serious breaches of law of many countries."