HARDtalk - Ambassador Richard Burt, Chairman, Global Zero initiative and Richard Perle, Former US Assistant Secretary of Defence

The presidents of America and Russia say they want a world free of all nuclear weapons to help make it a safer place. But even if they eliminate all their nuclear arsenal, what of terrorists and rogue states going nuclear? Zeinab Badawi asks two senior American officials with extensive experience in the field, Richard Burt and Richard Perle, whether it is too late to deal with the nuclear threat.