The video appears to have been edited, and the Fed said that it could not confirm its accuracy. The matter has been referred to law enforcement, the spokesperson said.
The two men who carried out the prank have also tricked other global leaders, including Christine Lagarde, the president of the European Central Bank, and Angela Merkel, Germany’s former chancellor.
An E.C.B. spokesperson said that Ms. Lagarde had agreed to the conversation in good faith, and to show support for Ukraine and its people.
The Fed-related video was posted on Rutube, a Russian video hosting platform, and covered by Russian state-run television and news agencies. Mr. Kuznetsov and Mr. Stolyarov posted excerpts from the call on their social media page, and dedicated a special episode of a show that they host to it.
The clips show Mr. Powell discussing a number of challenges facing the American economy — including rapid inflation and the possibility of a recession. In the clips, Mr. Powell acknowledges that an economic downturn is possible or even likely, but that it is necessary to cool the economy and slow price increases. That is consistent with what the Fed chair has said in testimony and speeches.