I think it was more him advocating that all of the countries with nuclear weapons should give them up.
In Utopia, maybe. But that is unrealistic in the world in which we live. And he's naive to think so.
That's why it's called the "Nuclear Genie" -- it's next to impossible to get it back in the bottle. And if you're lucky enough to do (say like Belgium or Canada), some other country or faction will rub their lamp and release their Genie...
The Russians and Chinese will NEVER give up their nuclear stockpiles (In fact they are increasing them). Obama, give it up.