While North Korea has ramped up missile tests and deployments in recent years, it hasn't detonated a nuclear device in several years as South Korea reportedly considers building its own nuclear deterrence (NBC News, US Naval Institute, Newsweek, CSIS). For the purposes of this question, a "nuclear device" is one that is designed to produce a nuclear explosion utilizing the fission and/or fusion of nuclear fuel (e.g., Uranium-235, lithium deuteride). A radiological device (aka "dirty bomb") would not count (Nuclear Regulatory Commission). North Korea's most recent nuclear detonation was in 2017 (BBC). A device that produces an explosive detonation for a subcritical test is not considered a "nuclear device" that is designed to produce a nuclear explosion (National Nuclear Security Administration).

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