Chinese president attends BRIC summit in Brasilia

Chinese President Hu Jintao and the leaders of Brazil, Russia and India met in Brasilia on Thursday to discuss the world economic and financial situation and other important global issues.

President Hu meets with Obama in Washington

U.S. President Barack Obama (L) greets China's President Hu Jintao at the Nuclear Security Summit in Washington, April 12, 2010. [Photo/Agencies] 

President Hu meets with Obama in Washington

Leaders in Washington for nuclear security summit

Leaders in Washington for nuclear security summit

Iran displays new centrifuge for nuclear work

President Mahmoud Ahmadinejad, taunting the United States for trying to halt Iran's nuclear programme, unveiled a new centrifuge on Friday which officials said would enrich uranium much faster then existing models.

Obama, Medvedev to sign disarmament treaty

The United States and Russia will sign a disarmament treaty in Prague on Thursday that could herald better bilateral ties and help President Barack Obama raise pressure on countries seeking to develop nuclear weapons.

Security in Washington tight

A member of the U.S. Secret Service looks out from the roof of the White House in Washington April 11, 2010. Security has been tightened throughout the city ahead of this week's nuclear security summit. [Photo/Agencies] 

Leaders in Washington for nuclear security summit

Leaders in Washington for nuclear security summit