Russia (or its predecessor, the Soviet Union) conducted its first successful nuclear test in 1949.
Sources
- List of states with nuclear weapons (en.wikipedia.org)
- https://www.icanw.org/soviet_union_tests_its_first_nuclear_bomb (icanw.org)
- https://www.history.com/this-day-in-history/august-29/soviets-explode-atomic-bomb (history.com)
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