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The first Soviet thermonuclear detonation took place on August 12, 1953 at the Semipalatinsk Test Site in the Khazak SSR (now Khazakstan). It was designated Joe-4 in the United States.

The warhead was designated RDS-6 (Reaktivnyi Dvigatel Specialnyi-6), and featured a yield of 400 kilotons (15-20% fusion yield, the rest was fission boosted by fast neutrons). The warhead design utilized a single-stage "layer cake" or Sloika design, so was incapable of being scaled up to a larger weapon like a Teller-Ullam style warhead would be.

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