Could military tensions between North and South Korea be thawing?

The two countries re-opened a direct communication line along the Demilitarized Zone in preparation for possible high-level talks next week. This follows a New Year’s Day speech from North Korean President Kim Jong Un, in which he made a rare overture for new negotiations with the South. But in that speech, Kim also said he had a nuclear button ready to launch an attack on any American target. President Donald Trump tweeted last night that he has a nuclear button that’s “much bigger & more powerful.”