<P> On 29 August 1949 , the Soviet Union secretly conducted its first successful weapon test ( First Lightning ) , based on the U.S. design at the Semipalatinsk in Kazakhstan . </P>
<P> On 29 August 1949 , the Soviet Union secretly conducted its first successful weapon test ( First Lightning ) , based on the U.S. design at the Semipalatinsk in Kazakhstan . </P>
when did the soviet union detonated its first atomic bomb
when did the soviet union detonated its first atomic bomb
29 August 1949
29 August 1949