Snowden could probably go to North Korea, but it's doubtful that he wants to.

The DPRK isn't going to stick to principles. They'll sell him off or use him as a bargaining token whenever they need, without thinking twice.

To be fair, this is the same influence that ensures that countries tend to want to keep American tourists somewhat safe.

Maybe they just don't care to resist US influence in this case as much as you would hope they would.