North Korea vowed to ramp up its long-range nuclear strike capabilities and other key military technology on Saturday in what experts say is both a threatening message to the United States and a subtle call for dialogue. But experts also believe that some of North Korea’s military goals are both unrealistic and an empty threat — especially since Pyongyang appears to be leaving the door open for dialogue.

For the fourth day in a row, Kim Jong Un reportedly met with thousands of delegates for the country’s Eighth Party Congress, where leaders decidedthat the country will upgrade weapons that