The conference is expected to look at improving security for nuclear materials worldwide and increasing international cooperation.

VOA: standard.2010.04.06

We also agreed that the most effective way to prevent terrorists and criminals from acquiring nuclear materials is through strong nuclear security -- protecting nuclear materials and preventing nuclear smuggling.

WHITEHOUSE: Nuclear Security Summit: Presidential Press Conference

We recognize the achievements made through the Nuclear Security Summits, including the removal and elimination of nuclear materials, minimization of the civilian use of highly enriched uranium, and worldwide improvements in a nuclear security culture.

WHITEHOUSE: The White House

Third, we reaffirmed that it is the fundamental responsibility of nations, consistent with their international obligations, to maintain effective security of the nuclear materials and facilities under our control.

WHITEHOUSE: Nuclear Security Summit: Presidential Press Conference