On April 5, 2009, when U.S. President Barack Obama spoke in Prague’s historic Hradcany Square, he was addressing a crowd of Czechs, but his audience was global. There was palpable excitement as the young new president outlined a vision of a world freed, at last, of the threat of nuclear weapons.

Hopes were raised for a serious movement toward nuclear disarmament, which in turn would drive a reinvigorated commitment to nuclear nonproliferation and nuclear security.

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