demilitarized zone
North Korea has blown up a vacant inter-Korean liaison office in a symbolic act of aggression.
Disbelieving South Koreans officials made him jump two more times to back up his claim.
After Trump on Sunday became the first U.S. president to enter North Korea, he and Kim agreed to restart nuclear talks.
Some hope for peace.
WHAT'S HAPPENING
South Korea accused the North of violating the armistice agreement that ended the 1950-53 Korean War.