“Bob from Omaha writes ‘what do Soviets do for fun?”. Well Bob, Soviets do a lot of things for fun.” - Radio Moscow announcer
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
"While you capitalist American pigs are starving in the streets! Mwa-ha!!!"
Right? Naw, they were never quite that crude back during the time that I listened.