Nuke summit 'safer world' call

The final communiqué from the summit of world leaders on nuclear security loosely calls for all vulnerable material to be secured in four years.

But the long and vaguely-worded document is light on specifics about how to cut the risk of atomic materials falling into the wrong hands.

U.S. President Barack Obama, speaking on day two of the summit, said greater international co-operation was needed

SOUNDBITE: U.S. PRESIDENT BARACK OBAMA SAYING (English):

"There are still too many bad actors in search of these dangerous materials and these dangerous materials are still vulnerable in too many places."

Obama sent several sharp messages to China to stop turning a blind eye to North Korea's defiance over its nuclear programme.

Chinese President Hu Jintao has reportedly indicated he's taking the stalemate seriously and registering his concerns with Pyongyang.

SOUNDBITE: CHINESE PRESIDENT HU JINTAO SAYING (Mandarin):

"We must eliminate the source of nuclear proliferation and nuclear terrorism, stick to the goals and principles of the U.N. Charter, stick to the new security concept that features mutual trust, mutual benefit, equality and co-operation, stock to using peaceful means to resolve hot issues and international disputes and create a favourable international environment for strengthening nuclear security."

Lee Myung-bak, president of the summit host nation South Korea said the leaders reaffirmed the need to work harder for a safer world.

SOUNDBITE: LEE MYUNG-BAK, PRESIDENT OF SOUTH KOREA, SAYING (Korean):

"We adopted the Seoul communiqué, this summit's official statement, unanimously. The Seoul communiqué comprehensively suggests measures to stop nuclear and radiation terror, which should be taken by each country."

Despite the grand international scale of the summit critics say it's just a talking shop.

North Korea and Iran's disputed nuclear programmes weren't on the agenda.

Nor was North Korea's announcement of a planned rocket launch next month.

Paul Chapman, Reuters