The Soviets dismissed stealth technology and allowed the physicist to publish his papers on it on the open network. Lockheed hired the guy to help develop the F117 fighter based upon his theories and equations. The rest as they say is HISTORY
I recall when Western sources noted the article in a Soviet publication and it was translated and published by the USAF. There was speculation that the Soviets were trying to develop a way to neutralize radar. In truth, the Soviets had permitted the publication because they regarded the subject as having no practical application. Fortunately, Lockheed and the USAF were already at work on the F-117.