The surface-to-air missiles launched late Thursday flew into waters off the country's eastern coast, said a South Korean defense official who requested anonymity because of official policy.
A South Korean Joint Chief of Staff officer, who also did not want to be named citing office rules, said North Korean leader Kim Jong Un inspected the missile tests, but he refused to say how he obtained the information.
Kim occasionally guides his military's weapons tests, according to Pyongyang's state media.
A Pentagon spokesman, Col. Steve Warren, confirmed the launch of multiple surface-to-air missiles Friday, saying they had fallen into the Sea of Japan.
"The North Koreans, we encourage them to stop bombing fish and to begin feeding their own people," Warren said. North Korea fired two short-range missiles on the first day of the drills earlier this month and warned of "merciless" strikes against South Korea and the U.S. The exercises are to continue until late April.
Earlier this year, North Korea told the U.S. That it was willing to impose a temporary moratorium on its nuclear tests if Washington canceled the drills, but the U.S. Rejected the offer.
