One guy on Radio Moscow with perfect American english was Vladimir Posner. He lived in the U.S. on and off in his early years. That’s how he got the American accent. He later appeared often on the Phil Donohuse show at the end of the Cold War.
Vladimir Posner
https://en.wikipedia.org/wiki/Vladimir_Posner
Joe Adamov was the other, see #32, for a fascinating interview with Joe post-Cold War.
Yeah . . . a big lefty who later toured America with Phil Donahue (who made him look like a "reactionary"). I used to hear him too.