The US president is pushing hard to stop the spread of nuclear weapons and to keep them from falling into the hands of extremist groups. Is the world better off without nuclear weapons or do we need more of them to keep the peace?
Keywords: aljazeera, rizkhan, Riz Khan, US, Barack Obama, Russia, Washington, nuclear weapons, nuclear free world, Lord David Owen, John Muller, Ariel Cohen, Cold war, Dimitri Medvedev
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