In 1949 the soviet union detonated their first atomic bomb. It is common knowledge that they had spies in the US stealing the secrets to the bomb, such as Greenwall, the Rosenbergs, etc. Let's say that they didn't have any spies in the US, or the spies were unsuccsessful, or they were caught before they could deliver the atomic secrets, how might this effect the soviet atomic bomb program? How long, if at all, would this delay the soviets first successfull detonation?