North Korean leader Kim Jong Un can take a unilateral step towards denuclearization that is straightforward, quick and has other positive benefits: He can sign the Comprehensive Test Ban Treaty (CTBT).Kim has already invited the international press to observe that he shut down his nuclear test site and said that he no longer needs to carry out nuclear tests.Another test site could be quickly built, but if Kim pledges to stop testing under terms of the CTBT he will have made a very significant step.To be sure, signing the CTBT does not guarantee intent to stop testing. Ratifying the treaty i…READ FULL ARTICLE