Else, of course, the Soviet program for a nuclear weapon, mused on in 1940, started in 1942, aided by the successful Soviet espionage programs at Los Alamos (inter alia) featuring many star spies, (Klaus Fuchs: Morris Cohen, Allan Nunn May, and a cast of less than thousands, not to forget the junior over-achiever, Ted Hall), which had the Soviets up date on each step of the process, down to David Greenglass’ rough sketches of the implosion lens for the plutonium weapon, would have produced nothing and First Lightning would never have occurred, since the 5 year gap would have caused the Soviets to end their crusade for nuclear weapons, from boredom, instead of striving to overcome the raw materials problems and the labor shortage would never have been put into Beria’s hands, said problems plus the general state of Soviet industry, post war, being so similar to that of the US, in the war.
Life is so simple.