Probably not the thread for this, and am hesitant, however my current understanding as a hypothesis, at least on the atomic bomb issues you brought up, was that the initial materials were flown out of
Great Falls with Lend Lease aircraft to Nome Alaska, and then up and over to Russia. It is not a well reported hypothesis.
From understandings (it would be a bit to gather up these limited bits and pieces, including, if believed, the first hand accounts of nuclear materials), said materials were piggybacked with the bulk of the true accounting of thousands of planes (
8,000.00) going through Nome and across the Bearing Straight (flown by NKVD pilots for the final leg). The fissionable material aspect was alleged to be within specific cargo aircraft later handed off. Some of it spilled, which was noticed. The materials likely came from sources connected to somewhere within The Manhattan Project, either west or east coast.
What made this Nome staging area different was that there were pilots and mechanics from both the U.S. and Russia on site. The NKVD pilots needed to be trained on each plane, the mechanics had to service each plane, and maintenance needed to paint and decal each plane in Russian insignia and colors before they left (4,000 km. trip). There was a lot of cross-interaction, and things where seen and discussed among the ranks.
These alleged hot and cold nuclear material hand-off's was not the stuff of the Rosenberg's (was that a diversion - although made serious?), it would seem to be, if so, from factions within the U.S Military and command (being guided from outside no doubt). If it happened this way, the seeds of a later cold war would be firmly planted right off the bat, and all could go about their business of testing weapons with the U.S. looking to Asia after the WWII (building up their forces, pleasing steel, mining and other manufacturing to no end), which the U.S. soon did - two weapons were not tests, as is known (this brings up the evidence (check SOTT.net) that the U.S. then had its sights not on Hiroshima/Nagasaki, but north to Russia. If so, and suddenly some knowing that Russia too might potentially have developed nuclear weapons, was that why the U.S. switched back to Japan and then sent a message?). If it happened this way, they might easily and immediately, on both sides, have understood the words mutual assured destruction (MAD) that could and did carry a cold war for decades, closing now to a last quarter of a century. The secretive trick on both sides, would be in containing the how, who and why with methods of deniability (Rosenberg's, British and Soviet spy's et cetera to draw off attention?), otherwise they would go about the business of cold war that all of us today have lived under for all those years, and still do.
Of note, think on how many thousands worked on Manhattan (ramped up to
600,00), with little to no information leaks in the beginning at least.
This is a much different version of how Israel got their fissionable material, yet there, too, it seems to have been given over by the U.S. and spy's were mixed into the narrative, too.
Never exactly comfortable with the British double and triple spy gangs doing all their doings on their own, although there were the Oxford, Cambridge and Mi5 boys mucking around, as was known and told. There were also so many later stories and leaks told that seem to have sowed much confusion in the telling. Confusion was/is the name of their game.
As said, this is just a hypothesis over other avenues told as to how atomic materials and their plans went from A to B during the WWII. If true, it can never likely be fully known or allowed to be even acknowledged.
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