Was there ever?
If there was it was due to U.S.' refusal to go back to talks!
https://www.counterpunch.org/2017/04/17/the-problem-is-washington-not-north-korea/ "And let’s be honest, the only reason Kim Jong Un hasn’t joined Saddam and Gadhafi in the great hereafter, is because (a)– The North does not sit on an ocean of oil, and (b)– The North has the capacity to reduce Seoul, Okinawa and Tokyo into smoldering debris-fields. Absent Kim’s WMDs, Pyongyang would have faced a preemptive attack long ago and Kim would have faced a fate similar to Gadhafi’s. Nuclear weapons are the only known antidote to US adventurism. "
Not to mention the American lemmings, Saddam Hussein and Gaddafi, thanks to their own stupidity of relinquishing the means to defend themselves, ended up dead meat! During the gulf war, Bush sr, was happy to send all those U.S. wanted "interrogated" i.e. tortured to Assad's Syria! Come 2011, oops, another........
Hardly surprising North Korea assessed it needed solid assurances of self preservation!
Nothing like a bargaining chip, nukes!
· 8 months ago