Video: 'First Soviet atomic blast (1949)'

(Monday, August 29, 1949, 7:00 a.m. local time; during the Cold War) — The Soviet Union conducted its first nuclear weapons test today, exploding the RDS-1 at the Semipalatinsk Test Site in the northeast of the Kazakh SSR, ending the absolute U.S. monopoly on nuclear weapons.

Video: 'Russian Atom Blast Shakes UN Assembly (1949)'

Video: '45 85 Part 3' (first Soviet atomic bomb announced Sept. 23, 1949, at 5:53)