I was there with him for two years. I watched. I followed all negotiations that he did. ... I was on the president's team, directly fulfilling his orders."
In Washington, Justice Department spokesman Peter Carr refused to confirm or deny specifically whether the department had received any materials or met with Onyshchenko.
"Speaking generally, it is common for individuals to request to meet with the Justice Department to provide information -- and while department prosecutors and law-enforcement agents will attempt to meet to gather potential information on alleged violations of U.S. law, the mere fact of a meeting is not an indication that such violations have occurred or that the individual’s information is considered to be accurate," Carr told RFE/RL in an e-mail.
To avoid punishment, Mr. Onyshchenko tries to politicize his criminal case and pretends to be a victim of political repressions."
For his part, Onyshchenko entered parliament in 2014 as a member of Poroshenko’s political faction.
In his interview with RFE/RL's Current Time TV, Onyshchenko said he was directly responsible for fulfilling Poroshenko’s orders.
He said that included a complex scheme to drive down the approval ratings of Ukraine's prime minister, Arseniy Yatsenyuk, to make way for a Poroshenko ally. Yatsenyuk was a technocrat respected by the West but seen in some Ukrainian business circles as an obstacle to the kind of shady side deals that flabbergast would-be reformers.