When Kim Jong-un took power in December 2011, many experts saw his ascent as an opportunity for the West to transform the last bastion of hard-line communism, believing that the untested leader would shy away from confrontation with the U.S. and even South Korea.
Instead, North Korea’s leader — believed to be about 30 years old — has “proved to be more ruthless, aggressive and tactically skilled than anyone expected,” Peter Sanger of The New York Times reports.
Here are a few things North Korea’s supreme leader has done in the past 18 months to surprise and unnerve the U.S.: