I will repeat the originator of this thread is taking the p*** out of you all.
There is a basic lack of knowledge on the development of the Soviet nuclear weapons. The Germans had less knowledge of nuclear weapons than the Russians and they did not need their help except in general industrial practices.
The first Russian A Bomb in 1949 was a plutonium device i.e. the product of a reactor. The idea that Geiger and other German scientists were coerced into helping them with industrial enrichment techniques is just coo-coo.