SEOUL, South Korea — Fully armed North Korean troops violated the truce that halted the 1950-53 Korean War when they fired weapons across the border last week while chasing a fellow Communist soldier defecting to South Korea, the United Nations Command said on Wednesday.

One of the North Korean chasers briefly crossed the borderline before turning back in a hurry, another violation of the Korean War armistice, the command said.

The American-led United Nations Command, which oversees the armistice, notified the North Korean People’s Army of its findings and demanded a meeting to discuss ways to prevent future violations, the command said in a statement.

The command also released closed-circuit television footage that illustrated the North Korean’s dramatic defection through the Joint Security Area north of Seoul, the South Korean capital, on Nov. 13. It was a close escape for the soldier, who bolted toward the border line just yards ahead of former comrades who had started to shoot.