In the last six decades it was the largest nuclear summit called by American president barrack obam.Almost forty seven nations were part of the summit in Washington when in an appeal of steps to prevent use of nuclear weapons in any kind of terrorist attack, forty economies accepted the appeal and has shown agreement with America. American president thanked the nations and said that it would be helping the international community to be more conscious on the safety of people of America which would in turn build a stronger relationship. During the nuclear summit the US president also informed that there would be changes to the US defense policy against North Korea and Iran.