Lee Jin-Man (Associated Press)
But there's a group of people people who would be much more affected by any escalation between Jong-un and the US - those who live along the 150-mile strip of land dividing North and South Korea, known as the Korean Demilitarized Zone.
A top US military general said that an all-out war with North Korea would be "horrific," but allowing the insular state to develop a nuclear weapon capable of striking the US would be "unimaginable."
Here are the latest photos of life on the fraught border between North and South Korea: