The fact was Stalin already knew more than any of the Americans or British imagined. Soviet nuclear research had begun in 1942, and as would be learned later, a German-born physicist at Los Alamos, a naturalized British citizen named Klaus Fuchs, had been supplying the Russians with atomic secrets for some time, information that in Moscow was judged “extremely excellent and very valuable.” Stalin had understood perfectly what Truman said. Later, in the privacy of their Babelsberg quarters, according to Marshal Georgi Zhukov, Stalin instructed Molotov to “tell Kurchatov [of the Soviet atomic
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