The North Korean statement pretty much confirms the story. Guess that also explains why they’re so willing to negotiate on their nuclear program. Perhaps we confronted them with our intel at the negotiating table.
There is already an established history of dealings in missile and other prohibited tech between Iran and NK. I see zero reason not to assume that NK is actively engaged in aiding and supporting any and all enemy’s of the West in general and the US specifically.
There is also a long established history of the USSR using NK Special Purpose Force personnel as trainers and support cadre for any “anti-western” terror organization that asked for help from the late ‘60s until the collapse of the USSR.
So it should be assumed that the NK knows who to talk to about what and how to arrange any logistics details.
I also think it would be foolish to assume that the NK has given up so much as to have disarmed itself of nukes. The safer assumption would be that enough were built to have a few extra to spare and share.
Of course, I’m only guessing from the same stuff everyone else has available, so I may well be way off, and Syria, Iran and NK are really nice places filled with fun folk. Who knows?