Does anybody think there is a realistic hope of denuclearizing N Korea. I read that N Korea is talking to both Russia and china. Obviously N Korea wants both as allies, both for security and leverage in any talks

One possibility is shipping missiles to Russia or china. N Korea will need supplies and Russia or china can and have broken the sanctions. What can the USA do about sanctions if china or Russia decide to not play ball

Some estimate N Korea has expanded missiles upwards to as many as 60. all or most of which could reach NA. If they continue, they will eventually get it right. N Korea will not change the end game. Just some small stuff designed to make the USA offer concessions. They even want Russia or china to verify anything they may do. 

IMHO N Korea will not give up their missiles

That piece of paper was all for show and to stroke Trumps ego. Kim played Trump like a fiddle

The signed agreement means nothing.

Trump tears up agreements all the time. So will Kim