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The first successful fission nuclear weapons test by the former Soviet Union, named First Lightning (Первая молния) was August 29, 1949. The American's code named it Joe1. The most important part of this test was the demonstration to the west that they were not alone in this nuclear club, despite several later not so effective tests into the H-bomb era for the Soviet Union. Yet, the Soviet Union relatively quickly caught up with not only yield, but the concept to miniaturize their weapons.

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16y ago

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