.The fact that President Trump and Vice President Pence continue to deny making concessions in public suggests that they believe their own propaganda—always a dangerous thing for politicians to do—and that they still do not understand the nature of the problem they are confronting. Thus, the idea that North Korea will merely give up its nuclear weapons under US pressure and/or that this outcome will occur quickly without a lengthy negotiation appears to be wishful thinking. This too does not bode well for future negotiations because under any realistic scenario, denuclearization of the North can only be the result of a process not a precondition to that process
https://www.38north.org/2018/04/sblank041818/