North Korea's Yongbon Nuclear Reactor was supplied by the Soviet Union. Russia came very close to selling North Korea a 200 MW reactor in the early 90s but the deal fell through when North Korea refused to pay. In 1994, the United States agreed to build 2 1000 MW reactors in North Korea as part of the Agreed Framework, which was only suspended after North Korea withdrew from the NPT.

There is not nor has there ever been any prohibition on providing nuclear technology and equipment to non-nuclear weapons states. In this particular case, France offered to sell Australia nuclear submarines back in 2016 and Australia decided against it, but one of their reasons for going with the French proposal was that the submarines could be converted to nuclear in the future.