If they were smart enough to develop the nukes, they're not stupid enough to surrender them.
The United States has proven with it's actions that it believes might makes right and that it is incapable of respecting anybody who cannot hurt them back. Ask the civilians of Iraq if it's a good idea to be on the weak side of Amerikwa. It's not. It's a death sentence.
North Korea will never disarm, unless you count using their nukes on San Francisco in WW3 to be a kind of disarmament.