[DesertRhino]

OH, now it makes sense. Kim stopped the testing because he was worried about releasing fallout through that “chimney”. I head he is quite an environmentalist and would be deeply concerned about contamination escaping.
Also, North Korea is almost a flat plain with no other mountains they could shift over to.

Lol..ANYTHING rather than give Trump a little credit. Laughable.

[Bruce Campbells Chin]

Some will use this as a reason not to give Trump any credit. But as you suggest, the truth is they could always use a different site. Trump and his Administration are using this as an opportunity to convince the Norks that continued testing will cause more problems for them -- including with the U.S. -- that it is worth.