Peace

I do not understand what President Obama is saying when he talks about Nuclear disarmament. Is he saying the US is going to destroy all their weapons in a public way?
Depleted uranium was used by the US in Iraq and Afghanistan and is President Obama saying that this will not happen again? Gorbochev and Regan had made a great diplomatic stride by making the world to agree on giving up on nuclear weapons. The world is no longer the same and for such agreements to happen again using diplomacy alone will take many more years to come.