The Soviet Union detonated its first atomic bomb, known in the West as Joe-1, on Aug. 29, 1949, at Semipalatinsk Test Site, in Kazakhstan. The Soviets called their first atomic test "First Lightning." ...

Ivy Mike was the world's first hydrogen bomb and had a yield of 10.4 megatons, making it 700 times as strong as the first atomic bomb ... On October 23, 1961, the Soviets conducted nuclear ...

The Atomic Energy Act of 1946 established the ... expand facilities in preparation for the production of the H-bomb. The Soviet Union's response to Truman's January announcement was swift.