Well, no. At least not any more. Probably. They did have a huge property out in Western Australia. Seismometers around the world recorded a large seismic event in this tectonically stable area back in May 1993. Some say the signature was like a nuclear blast. But nobody thought to go check it out. For years. When someone finally went out there, long after Aum Shinrikyo had abandoned the sheep station, they found a technical lab, and many sheep who had died from exposure to several things. Including radiation and sarin. Bill Bryson kinda created the modern mythology of the Aum-Nuke in his book, "In a Sunburned Country", but ... the facts are all there. They are all weird. And you can extrapolate that Aum possibly had a successful nuclear test on that site, long before their sarin gas attack on the Tokyo subway. So... yeah. Do with that what you will...
Except the fact that a bunch of Asian boneheads did this (possibly) without any government backing, decades ago. Long before Pyongyang got their shit together enough to do it. So Cult? Check. Nuclear ambitions? Check. Asian peninsula? Check. Seemed relevant to me at the time I posted it...