Patten and Foreigner A contacted members of Congress, U.S. government officials and the news media to push the Opposition Bloc's interests, according to court papers.
Patten is a former associate of Paul Manafort, the former chairman for President Donald Trump's campaign, and Konstantin Kilimnik, a former Russian intelligence officer.
The goal, prosecutors say, was to influence US policy, but they say Patten never filed under the Foreign Agents Registration Act.
Prosecutors said this violated the Foreign Agents Registration Act.
The Patten case was referred by Mueller's team to the United States attorney's office in Washington, said Bill Miller, a spokesman for the office.
Patten appeared in federal court in Washington on Friday.
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Patten stood with his attorney, Stuart A. Sears, and after surrendering his passport and was released on his own recognizance pending sentencing. The individual paid $50,000 for the tickets, after receiving the same sum from a company controlled by Patten and an unnamed Russian national.
Berman Jackson is also scheduled to preside over Manafort's trial in September. Mr. Patten faces up to five years in prison and a fine of up to US$250,000. From 2014 until now, according to Bloomberg, Patten lobbied on behalf of a Ukrainian political party, and on behalf of a Ukrainian oligarch.
Patten also illegally used $50,000 from a Cypriot account to buy four tickets to Trump's inauguration by using an American citizen to make the purchase - then attended the gala himself alongside the oligarch, according to a separate court document. Back in June, Mueller issued a superseding indictment, adding obstruction of justice and conspiracy charges to a litany of lobbying and fraud offenses allegedly committed by Manafort. And he worked in Kazakhstan, where he consulted for multinational companies like Coca-Cola and Texaco and reopened the country office for the International Republican Institute, a nongovernmental civil society group that promotes democracy and elections.
He worked closely with Manafort for years in Kiev, when they advised Moscow-backed President Viktor Yanukovych. Also in attendance was Scott Claffee, a trial lawyer in the Justice Department's National Security Division.
Patten also did work for the parent company of Cambridge Analytica, the now-defunct political data firm that was embroiled in a controversy over its use of Facebook Inc data, according to interview transcripts submitted by academic Emma Briant and published by British lawmakers earlier this year.
The work involved setting up meetings in January 2015 with officials in the executive branch and members of Congress, to influence USA policy.
Manafort and Kilimnik were both indicted as part of special counsel Robert Mueller's Russian Federation probe.