Why more nuclear states won't enhance security

 Is the age of nuclear nonproliferation over? There are certainly worrying signs. New START, the main nuclear treaty between the United States and Russia, recently expired. China is rapidly expanding its nuclear arsenal. Talks to bring Iran back to the negotiating table seem to be at an impasse. And one increasingly hears about the possibility of South Korea or Japan going nuclear. What can the world do in response?

Rafael Grossi, the director-general of the International Atomic Energy Agency, sits down with Ravi Agrawal.

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