Nuclear Disarmament - Is it possible for all countries?

Something that I suddenly remembered when I recalled the meeting of Pres. Kim Jong Un of North Korea and also Pres. Donald Trump of USA of course. NoKor signed that they are disarming their nukes to show they are willing to give peace a chance esp between North and South Korea.

So yeah. The topic itself is intriguing. And I'm pretty sure the Industrial, Superpower countries namely USA, China, Russia and some countries in Europe would definitely not do such a thing because those governments think of their nukes as a way to protect their sovereignty on their countries. What others don't know is the freaking nuclear waste these countries get from the nukes which are so radioactive that it is hard to dispose (thinking about it, these governments should dispose it in space instead if it is possible).

I'm living in a country that is not a superpower (that doesn't have nukes)and I really am scared thinking that things might not go well especially on what happened on Chernobyl, Russia years ago.

So what can you say? Do you think world leaders would actually agree to disarm their nukes and give world peace a chance? I'm just wondering since I saw it in a movie. But that's just in the movies. And I wonder what Einstein's reaction would be if he is still living until today that his equation is being used to produce these bombs?

Indeed. I'm just wondering....