Alexey Navalny has published new corruption allegations against Deputy Prime Minister Sergey Prikhodko and oligarch Oleg Deripaska, alleging that the two met aboard Deripaska’s yacht in August 2016 off the coast of Norway, possibly to discuss the oligarch’s relationship with Paul Manafort and his role in Russia’s interference in the 2016 U.S. presidential election.

Navalny says he learned about the meeting thanks to an escort who posted photos from the excursion on Instagram. Navalny says the trip amounts to a bribe, insofar as Deripaska apparently flew Prikhodko in on his private jet and then provided him with the services of an “escort girl.”

Navalny also alleges that Prikhodko owns a home valued at 300 million rubles ($5.2 million) in a luxurious area outside Moscow, as well as two apartments in the city worth almost 500 million rubles ($8.7 million) — real estate that the oppositionist says Prikhodko could only afford because of bribes.

Yachts, oligarchs, and prostitutes: A sex-hunter exposes a bribe-taker Alexey Navalny

Navalny is calling on President Putin to fire Prikhodko and question Deripaska about the trip. He says he’s already filed formal appeals to the Investigative Committee, Federal Security Service, and Attorney General’s Office. “Don’t disgrace yourself and the country,” Navalny told Putin.