North Korea violated the armistice agreement as one of its soldiers crossed the Military Demarcation Line, the border between the two Koreas, chasing a soldier who defected to the South, UN Command (UNC) has said.

The North Korean soldier made a desperate dash to freedom in a jeep and then on foot, being shot at least five times as he limped across the border and was rescued by South Korean soldiers, according to dramatic video released by the UNC.

The North violated the armistice agreement ending the Korean War by firing across and physically crossing the border in pursuit of the soldier, Colonel Chad G Carroll, a spokesman for the UNC, told reporters in a live TV briefing. North Korean soldiers fired about 40 rounds at the defector.

The video shows the soldier speeding down a tree-lined road, past shocked North Korean soldiers, who begin to run after him. He crashes the jeep near the line that divides North and South and the blue huts familiar to anyone who's toured the area, which is the part of the border where North and South Korean soldiers face each other at their closest distance just metres away. There were no tour groups at the time of the defection, Col. Carroll said.

Soldiers from the North sprint to the area, firing their weapons at the defector; one hurries across the dividing line before running back to the northern side. South Korean soldiers then crawl up to the defector, who has fallen injured in a mass of leaves against a small wall. They drag him to safety as North Korean troops begin to gather on their side of the line.

Surprisingly, North and South Korean soldiers didn't exchange fire in the first shooting in the area in more than three decades.

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Col. Carroll said the North violated the armistice by “one, firing weapons across the MDL, and two, by actually crossing the MDL temporarily,” referring to the Military Demarcation Line that bisects the Koreas. KPA stands for the North's Korean People's Army.

A UN Command statement said officials notified the North's military of these violations and requested a meeting to discuss the investigation results and measures to prevent future such violations.

North Korea hasn't responded and its official media haven't reported on the case. The North has previously accused South Korea of kidnapping or enticing North Koreans to defect. About 30,000 North Koreans have fled to South Korea, mostly via China, since the end of the 1950-53 Korean War.

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South Korea's military has said North Korean soldiers used handguns and AK rifles to fire about 40 rounds at their former comrade, who was hit at least five times. A UN Command helicopter later transported him to the Ajou University Medical Centre near Seoul.

The defector remains in hospital after two rounds of surgery that removed bullets from him.

The soldier has recovered consciousness and is breathing on his own following surgery, Ajou University Medical Centre said in a statement.

The soldier, who requires further intensive care, is cooperating with treatment but is hesitant to speak, the hospital added.

While treating the wounds, surgeons removed dozens of parasites from the soldier's ruptured small intestine, including presumed roundworms that were as long as 27 centimetres (10.6 inches), which may reflect poor nutrition and health in North Korea's military. The soldier is 1.7 meters (5 feet, 7 inches) tall but weighs just 60 kilograms (132 pounds).