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I am not suggesting that the Captain of the U-250 gave away the secrets to the Russians as he was captured in mid-1944 and there are suggestions that the Soviets were reading some communications by the Battle of Kursk a year earlier, what I am suggesting is that with the availability of captured machines and codebooks such as that which they must have got from the U-250 along with corroborating data from spies at Bletchley Park they must have at least made progress in breaking the codes.
The Russians must have been getting equipment from the Wehrmacht in reasonable quantities as early as the 1941 winter offensive, combine that with "vigorous" interrogations of captured operators and the volume of high quality mathematicians in Russia you would have to assume that they were capable of reading Enigma.
We are more often treacherous through weakness than through calculation. ~Francois De La Rochefoucauld |