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In this photo provided by South Korea Defense Ministry, South Korea's Hyunmoo II ballistic missile is fired during an exercise at an undisclosed location in South Korea, Monday, Sept. 4, 2017. In South Korea, the nation's military said it conducted a live-fire exercise simulating an attack on North Korea's nuclear test site to "strongly warn" Pyongyang over the latest nuclear test. Seoul's Joint Chiefs of Staff said the drill involved F-15 fighter jets and the country's land-based "Hyunmoo" ballistic missiles. The released live weapons "accurately struck" a target in the sea off the country's eastern coast, the JCS said. (South Korea Defense Ministry via AP)
In this photo provided by South Korea Defense Ministry, South Korea's Hyunmoo II ballistic missile is fired during an exercise at an undisclosed location in South Korea, Monday, Sept. 4, 2017. In South Korea, the nation's military said it conducted a live-fire exercise simulating an attack on North Korea's nuclear test site to "strongly warn" Pyongyang over the latest nuclear test. Seoul's Joint Chiefs of Staff said the drill involved F-15 fighter jets and the country's land-based "Hyunmoo" ballistic missiles. The released live weapons "accurately struck" a target in the sea off the country's eastern coast, the JCS said. (South Korea Defense Ministry via AP)

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N. Korea responds to S. Korea's missile drill

North Korea releases a statement about South Korea's live-fire drills. CNN's Ian Lee has more.

N. Korea responds to S. Korea's missile drill

North Korea releases a statement about South Korea's live-fire drills. CNN's Ian Lee has more.