I don't believe this was on Trump's watch.

On January 22, 2013, Pyongyang made a shocking statement that its denuclearisation was 'no more possible' due to ‘intensifying US hostility’.”

https://www.express.co.uk/news/world/896265/North-Korea-Kim-Jong-un-Kim-Jong-il-Pyongyang-China-Russia-propaganda-nuclear-test