Something doesn't feel right about this story. The Soviets struggled mightily to keep their hi-tech infrastructure at just par with the rest of the world. They relied heavily on secrets stolen from their own agents around the world.
Now we're told they had an aeronautics program ten years ahead of everyone else.
It could be true, I suppose. A Soviet scientist could have made one of those history-making breakthroughs that catapulted their capabilities far into the future.
But why have we never heard of such a breakthrough? It would have been, as I said, history-making. Where is the history?