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As long as some of us choose to rely on nuclear weapons, we continue to risk that these same weapons will become increasingly attractive to others.

We can be just as safe with a smaller, more efficient nuclear arsenal at less cost.

Nuclear weapons offer us nothing but a balance of terror, and a balance of terror is still terror.

If we have isolated individuals able to inflict enormous harm, imagine what a single lunatic can do with a nuclear weapon. I think the whole base of civil society is at risk.

There are risks which are not acceptable: the destruction of humanity is one of them.

I'm absolutely convinced that the threat we face now, the idea of a terrorist in the middle of one of our cities with a nuclear weapon, is very real and that we have to use extraordinary measures to deal with it.

The message from national security experts and citizens around the world is clear: The only way to eliminate the global nuclear danger is to eliminate all nuclear weapons.

Proliferation of nuclear weapons to terrorist organisations is far more dangerous than proliferation of nuclear weapons to states, even states like North Korea.

We are not afraid of nuclear weapons. The point is that if we had in fact wanted to build a nuclear bomb, we are brave enough to say that we want it. But we never do that.

A world without nuclear weapons would be less stable and more dangerous for all of us.