Going on a tangent:
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While the Cold War officially began 1947, you can't disregard the events that led to high tensions between the Americans and Soviets who had only recently been allied during WW2. One of the key factors was definitely the predecessor to the Nuclear Arms race.
According to Chikov, "Perseus" (alias) was a high-level scientist who worked at the White Sands Missile Range and the Los Alamos National Laboratory in New Mexico. He supposedly came aboard the Manhattan Project over a year before any of the other known spies, and the secrets he provided helped give the Soviets a head start in developing their own nuclear program.
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"He was the one who met courier Lona Cohen in Albuquerque in August 1945
and handed her papers with a diagram of the plutonium bomb, which she,
supposedly stuffing in a Kleenex box, carried back to Yatskov in New York."
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"Without a copy they probably
could not have produced an atomic bomb in Stalin's time and he would not
have encouraged Kim Il Sung to start the Korean War."
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The spy who retrieved the documents related to Nuclear bomb testing is known as "Perseus" and to this day remains unidentified.
During the Yalta and Potsdam conferences (1945), there was no mention of nuclear capabilities or of the Manhattan project (1942-46) between the US and Soviets. I wonder why? Ultimately, it was a collaboration with U.S, Canada, and U.K only.
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And lastly, the "absolute pacifist" Albert Einstein sending this letter to FDR insisting on funding labs and programs to utilize the newly discovered phenomena of nuclear fission.
"This new phenomenon would also lead to the construction of bombs, and it is conceivable -- though much less certain -- that extremely powerful bombs of a new type may thus be constructed."
He also encouraged to seek new sources of Uranium (since there was scant in the U.S) such as in Canada and the Belgian Congo (which, not surprisingly were under British dominion at the time)
"The United States has only very poor [illegible] of uranium in moderate quantities. There is some good ore in Canada and the former Czechoslovakia, while the most important source of Uranium is Belgian Congo."
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regarding the use of nuclear bombs after Nagasaki and Hiroshima:
"had I known that the Germans would not succeed in developing an atomic bomb, I would have done nothing."
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and Surprise! the sneaky soviets blew their first A-bomb on Aug 29, 1949
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