Chip Somodevilla/Getty Images Paul Manafort
Kilimnik's comments came a day after The Washington Post reported that Manafort, Trump's campaign chairman at the time, sent Kilimnik an email in July 2016 asking him to offer Russian billionaire Oleg Deripaska "private briefings" about the campaign.
"There were millions of emails," Kilimnik told RFERL in a text message. "We worked for 11 years. And we discussed a lot of issues, from Putin to women."
"Of course we discussed Trump and everything," he said in another message. "A lot of things."
Manafort had written a cryptic note to Kilimnik, who has been scrutinized by US federal investigators for suspected ties to Russian intelligence, shortly after being named a campaign strategist in April.
"How do we use to get whole?" Manafort wrote.
Jason Maloni, a representative for Manafort, told The Washington Post that Manafort had simply been trying to leverage his high-level role on the campaign to collect past debts.
Kilimnik seemed to echo that statement, telling RFERL that "our clients owe us money."
"Is there any violation of the law or proof of my work for KGB or whoever in those discussions?" he asked, according to RFERL.
But it was Manafort who, according to Russian billionaire Deripaska, owed him money - not vice versa.
Legal complaints filed by Deripaska's representatives in the Cayman Islands in 2014 said he gave Manafort $19 million in previous years to invest in a Ukrainian TV company called Black Sea Cable. The project fell through, and Manafort all but disappeared without paying Deripaska back, the filings claimed.
Kilimnik insisted that "on the political side there is no case that can be made about my involvement in the US elections," according to RFERL.
"They are tough investigators and probably will get Manafort for some financial crap," Kilimnik said, in reference to the FBI. "With that many years of international clients no one can be 100% clean."
Manafort's lobbying work on behalf of Ukraine's pro-Russia Party of Regions and his business dealings with Russian entities has been under scrutiny by the FBI since at least 2014. He finally registered as a foreign agent in April under pressure by the Justice Department, but the focus on him as only increased since special counsel Robert Mueller took over the Russia investigation in May.
Since then, the FBI has also conducted a raid on one of Manafort's homes in July, in search of tax documents and foreign banking records. Mueller threatened to indict Manafort following the raid, according to The New York Times.
New York Attorney General Eric Schneiderman is reportedly helping Mueller investigate Manafort for possible financial crimes and money laundering. The IRS's criminal-investigations unit has been brought onto the investigation to examine similar issues.