Analysis: Beyond the bluster back channel diplomacy with North Korea continues

Beyond the bluster, the Trump administration has been quietly engaged in back channel diplomacy with North Korea for several months - addressing Americans imprisoned in the communist country and deteriorating relations between the long-time foes, writes Matthew Pennington of Associated Press. 

It had been known the two sides had discussions to secure the June release of an American university student. But it was not known until now that the contacts have continued, or that they have broached matters other than US detainees.