"Everything previous administrations have tried since the 1970s has not come close to working."

In other words, this proposed form of appeasement to the DPRK was not even palatable to the Great Appeaser who served as POTUS before President Trump.

If / when the DPRK lobs ICBMs within the very near vicinity of, let's say, Guam, the DPRK will have sealed its fate. The US is not going to wait to see if, by luck, those missiles miss Guam by a few miles. They will shoot down the missiles and then shoot back.