Initiative to hold a global nuclear security summit in Washington "was absolutely timely" and the summit itself was "crowned with a complete success," Russian President Dmitry Medvedev said Tuesday in a speech at the Brookings Institute on the results of the summit that had brought together the leaders of 47 countries, the UN, the International Atomic Energy Agency, and the European Union.

• April 14, 2010

World leaders agree to secure all vulnerable nuclear material within four years, President Obama says.

• April 14, 2010

Chinese President Hu Jintao left here Monday morning for the upcoming Nuclear Security Summit on April 12-13 in Washington at the invitation of the U.S. President Barack Obama. Hu will deliver a speech stressing the

• April 13, 2010

World leaders at a security summit in the US hear dire warnings about nuclear material falling into the wrong hands.

• April 13, 2010

Iran asks the UN to investigate Western actions in Afghanistan and Iraq amid growing nuclear tensions.

• April 13, 2010

Ukraine has agreed to get rid of its stockpile of weapons-grade uranium in a move that gave President Obama the first significant achievement at the Nuclear Security Summit of 47 nations that opened yesterday in Washington.

• April 13, 2010

A leading judge has been shot dead at his apartment building in the Russian capital, Moscow court officials have said.

• April 12, 2010

A year ago in Prague, President Barack Obama pushed a three-pronged plan to move toward a world without nuclear weapons -- and announced a Global Nuclear Security Summit in 2010 to help make that happen.

• April 12, 2010