how many countries has been confessed they involved in nuclear research or production in history?

Answer 1

All countries if given the chance wants to be a nuclear power and have the capability to become one. They are never open or frank in admitting that they are doing such research or involved in such endeavours.

Answer 2

I don't know properly but ikow know that most people do not confess that they are involved in nuclear research you can mail to me if you get the answer to [e-mail]...............bye....avinash