Debate: Nuclear summit

This week's nuclear security summit promises to address some of the most pressing issues facing the global community. What is at stake for its members? Two experts give us their views.

Li Hong: Agenda for the Obama administration

This week, the focus of the world media has turned to Washington for the nuclear security summit. With frequent interviews, special reports and comments inside and outside the US, President Barack Obama and his team have been delicately highlighting America's leadership in nuclear disarmament, non-proliferation and the fight against terrorism.