Updated

Supporters of Russian opposition leader Alexei Navalny are awaiting his return at Moscow’s Vnukovo airport, where the Kremlin foe faces the threat of arrest on his arrival.

"In Vnukovo!" wrote prominent opposition activist Lyubov Sobol on Sunday, in a translated tweet.

"Greetings to all from Vnukovo. Came to meet a friend here," wrote fellow opposition activist Ruslan Shaveddinov,  in a translated post on Instagram.

Navalny supporters and members of his team have been detained by police at the airport, according to subsequent reports and posts on social media.

Video tweeted by @SvobodaRadio showed Lyubov Sobol being detained.

KREMLIN FOE NAVALNY SAYS HE WILL FLY HOME DESPITE THREATS

Navalny is traveling from Berlin to Moscow after recovering in Germany from his poisoning in August with a nerve agent. The opposition leader said he was "very happy" as he boarded the plane.

Alexei Navalny is surrounded by journalists inside the plane prior to his flight to Moscow in the Airport Berlin Brandenburg (BER) in Schoenefeld, near Berlin, Germany, Sunday, Jan. 17, 2021. (AP Photo/Mstyslav Chernov)

He announced Wednesday that he would return, despite Russian authorities' threats to put him behind bars again. On Thursday, Russia's prison service said he faces immediate arrest once he returns.

"We fly home," Navalny wrote in a translated tweet at 9:12 a.m. ET on Sunday morning, with a link to a short Instagram video of the opposition leader and his wife Yulia Navalnaya on the plane.

NAVALNY: I'M SURE PUTIN IS RESPONSIBLE FOR MY POISONING

"Flew," wrote Navalny spokeswoman Kira Yarmysh in a translated tweet with an image of the opposition leader surrounded by photographers on the plane.

Moscow’s Vnukovo airport, where Navalny’s flight is due to land, last week said it is banning journalists from its terminal, citing epidemiological concerns.

Twitter user @VVPynka tweeted that a high opaque screen has been erected at Vnukovo’s international arrivals hall ahead of Navalny’s arrival.

PUTIN DENIES INVOLVEMENT IN POISONING OF OPPOSITION LEADER ALEXEI NAVALNY

Navalny, who has blamed his poisoning on the Kremlin, charged that Russian President Vladimir Putin was now trying to deter him from coming home with new legal motions. The Kremlin has repeatedly denied a role in the opposition leader’s poisoning.

CLICK HERE TO GET THE FOX NEWS APP

At the end of December, the Federal Penitentiary Service, or FSIN, warned Navalny that he faced time in prison if he fails to immediately report to its office in line with the terms of a suspended sentence and probation he received for a 2014 conviction on charges of embezzlement and money laundering that he rejected as politically motivated. The European Court for Human Rights had ruled that his conviction was unlawful.

The Associated Press contributed to this article.

Follow James Rogers on Twitter @jamesjrogers