U4L4: Document A Source: Lavrentiy Beria, “Soviet Response to the H-Bomb,” 1950. On May 25, 1950, Lavrentiy Beria, the head of the Soviet nuclear weapons program, wrote a letter to Stalin in response to the U.S. explosion of a hydrogen bomb. Below is an excerpt from this letter. As you know from speeches being made by U.S. leaders and from numerous articles in the foreign press, the United States and other foreign countries are making a sensation of the hydrogen superbomb . . . Given our enemy might become the owner of a new quite effective weapon, we believe it’s possible to set up the investigations and practical work on the development of a hydrogen bomb design and the productions of the materials needed [tritium, deuterium, lithium-6] in spite of all the above mentioned difficulties. Who: What: Where (Soviet or US): When: Why/CI:

Who: Lavrentiy Beria, the head of the Soviet nuclear weapons program

What: Writing a letter to Stalin in response to the U.S. explosion of a hydrogen bomb
Where: Soviet Union
When: May 25, 1950
Why/CI: The purpose of the letter is to inform Stalin about the U.S. development of a hydrogen bomb and to propose that the Soviet Union should also start working on its own hydrogen bomb program.