The wall didn't come down in Stalin's lifetime. And not is Kruschevs. Or Breznevs. Dear lord I have no idea how to spell those names. The man in Tienanmen Square didn't bring around any lasting change, in fact most chinese citizens are ignorant of what happened there. And Nelson Mandela was freed because a western power listened to western pressure to end apartheid as much as anything else. We still haven't made peace with Castro, and Cuba is on our doorstep, and infinitely less fanatical than NK. The only time it will stand a chance is during the regime change in NK.