NTBT is great treaty designed to protect people from nuclear exploitation. Nuclear weapons are really harmful and can really get into atmosphere, and effect lots of people. Nuclear weapons are to be tested away from where people live. I think studies of nuclear is important but should be kept under strict guidance.
Treaties have been notoriously ineffective throughout mankind. The bottom line is this, countries are going to do what they want to do unless someone else forcibly stops them. Since a treaty does not forcibly stop anyone from doing anything at all they will continue their activities until war breaks out and someone stops them.