Aug 31 (Reuters) - An American who is the business partner of a Russian national accused by U.S. Special Counsel Robert Mueller of having ties to Russian intelligence pleaded guilty on Friday to unregistered lobbying for a pro-Kremlin political party in Ukraine and agreed to cooperate with Mueller's probe.
Samuel Patten, 47, also admitted to arranging for a U.S. citizen to act as a straw purchaser to pay $50,000 for four tickets to the inauguration of President Donald Trump on behalf of a Ukrainian oligarch, who reimbursed Patten through a Cypriot account.
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The move circumvented U.S. law prohibiting foreigners from providing money to an organization running the inauguration. The tickets were given to the oligarch, another Ukrainian, Patten and the Russian national, according to the charging documents.
While the documents did not name the Russian national, the description matches Konstantin Kilimnik, Patten's business partner, who was indicted along with former Trump campaign chairman Paul Manafort in June for witness tampering in an ongoing criminal case in Washington.
Mueller has said Kilimnik, who once served in the Russian army as a translator, has links to Russian spy agencies. Kilimnik, who in the past has denied such ties, did not respond to a request for comment on Friday.
Patten's plea agreement, which includes cooperating with Mueller, raises the prospect Patten will be called to testify against Manafort, who was found guilty by a Virginia jury last week on bank and tax fraud charges and faces a second trial in Washington next month.
The charge Patten pleaded guilty to - violating the Foreign Agents Registration Act (FARA) by not disclosing lobbying work for Ukrainian politicians - is similar to one of the core allegations against Manafort in his upcoming trial.
Michael Zeldin, a former federal prosecutor, predicted Patten will be a witness in the trial. "I expect his value as a cooperating witness is he will know how those guys conducted their business relations and can probably shed light on efforts made to evade FARA reporting requirements," he said.
Patten admitted to working with the Russian national to lobby members of Congress and the executive branch on behalf of the pro-Russian Opposition Bloc without disclosing the work to the U.S. government, as required by law.
The charge, which carries a maximum of five years in prison, was brought by the U.S. Attorney for the District of Columbia and the Justice Department's National Security Division, which started investigating Patten after a referral from Mueller.
Patten appeared before U.S. District Judge Amy Berman Jackson, who will oversee Manafort's upcoming trial. Patten did not speak to reporters at the court, but apologized to family and friends on Facebook after entering his plea.
"I was wrong not to have filed under FARA for the representational aspects of my work on behalf of the Opposition Bloc in Ukraine," Patten wrote in a post seen by Reuters, adding that he had sought to promote democracy during a political consulting career that included work in Europe, Africa and the Middle East.
"That is why I deeply regret any damage my failure to register has done to the transparency the FARA statute seeks to guarantee."
Patten's work in Ukraine dovetailed somewhat with that of Manafort. Manafort made most of his money working for former Ukrainian President Viktor Yanukovych before he fled to Russia in 2014, but like Patten also sought to drum up business with the Opposition Bloc in the aftermath of Yanukovych's exit, it was revealed at Manafort's trial.
Patten's ties to Kilimnik are more concrete. The two set up the political advisory firm Begemot Ventures Ltd LLC in February 2015. Since 2015, the company was paid more than $1 million for their work for Opposition Bloc members and for other work in Ukraine. The unidentified oligarch was one of their biggest benefactors, the charging documents said.
Patten helped Kiev Mayor Vitali Klitschko get re-elected in 2015, according to an archived page from Patten's website.
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. (Reporting by David Alexander in Washington, and Nathan Layne and Jonathan Stempel in New York; editing by Cynthia Osterman and Dan Grebler)