Trump has talked like as the great negotiator; this would be solved during the first days he was in office.   Now reality shows its another of the Trump unknown parts of the presidency coming to the forefront: who knew North Korea was such a complicated issue. Apparently everyone but Donald knew. This is an issue over 50 years  and multiple presidents have had to deal with. But Trump paid no attention to any of them during the campaign. 
Trump claimed he was smarter than all the generals and would deal with all such issue on his own. Now he letting the Generals come up with solution so the results will not be on him. Sorry Donald but maybe you should have actually spent time during the campaign listening to your advisors and those who had previously dealt with the complexity of world leaders who hate the US.
There is no easy solution as previous president all faced the potential devastation North Korea is capable of bringing to South Korea, Japan and probability some others.