Developing nuclear weapons by trial and error is not a good idea, hope nobody tries it at home. Rosenbergs definitely participate in espionage. Whatever one specific spy accomplished is not even relevant. The enemy uses all obtained material, uses that to direct further collection and their own research .. Khrushchev et al would not care about the role of a specific spy, except playing it to gullible Americans for political purposes. So you can safely disregard anything any Soviet leader or engineer said.
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