North Korea conducted its first successful nuclear test in 2006.
Notes on verification
Confirmed by multiple independent, high-quality sources including seismic data, government announcements, and contemporaneous news reporting.
Sources
- List of states with nuclear weapons (en.wikipedia.org)
- https://www.cbsnews.com/news/north-koreas-nuclear-tests-timeline/ (cbsnews.com)
- https://www.globalsecurity.org/wmd/library/news/dprk/2006/dprk-061009-afps01.htm (globalsecurity.org)
- https://www.aljazeera.com/news/2017/9/3/timeline-of-north-koreas-nuclear-tests (aljazeera.com)