August 8, 1953

RDS-6s

Malenkov declares that the United States lacks an H-bomb monopoly

His claim was a double negative — the United States had "no monopoly" on producing the hydrogen bomb. The Soviet Union would not test one for another four days.

One sentence inside a long speech

On 8 August 1953, Soviet premier Georgy Malenkov addressed the Fifth Session of the Supreme Soviet in Moscow. The sentence that seized foreign attention sat inside a speech ranging from consumer welfare to state budgets.

After discussing the former American atomic-bomb monopoly, he said the Soviet government considered it necessary to report that the United States also had no monopoly on producing the hydrogen bomb. The chamber answered with prolonged applause.

What he did not say

Malenkov described no completed test, named no device and disclosed no technical evidence. He announced a claimed capability, in language considerably less explicit than the headline it produced abroad.

The first Soviet thermonuclear test came four days later, on 12 August, so the declaration preceded the detonation rather than reporting it.

The device behind the claim

The device was RDS-6s, which the speech neither named nor located. The U.S. Atomic Energy Commission subsequently reported that the test involved both fission and thermonuclear reactions.

Whether RDS-6s counts as a true hydrogen bomb is disputed, because it was a single-stage layered weapon rather than a scalable Teller-Ulam design. The Soviet Union first tested a two-stage radiation-implosion weapon, RDS-37, on 22 November 1955.

Sources

Researched 23 Aug 2026 6 sources 2 audit passes

How this was checked

Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →

What the sources leave uncertain

The date and wording are well documented. The listed title is a stronger paraphrase than Malenkov's actual formulation: he said the United States lacked a production monopoly, not literally “we have detonated a hydrogen bomb.”
Whether RDS-6s should be called a “true hydrogen bomb” is technically and historiographically disputed because it was a single-stage layered weapon rather than a scalable Teller–Ulam design.