SEOUL, South Korea — North Korea launched a short-range ballistic missile toward its eastern waters on Thursday, South Korea’s military said, hours after the North threatened to launch “fiercer” military responses to the U.S. bolstering its security commitment to its allies South Korea and Japan. It said South Korea has strengthened its surveillance of North Korea while maintaining military readiness in close coordination with the United States. It was North Korea’s first ballistic missile firing in eight days and the latest in its barrage of tests in recent months. North Korea previously said some of the tests were simulations of nuclear attacks on South Korean and U.S. targets. Many experts say North Korea would eventually want to enhance its nuclear capability to wrest bigger concessions from its rivals.

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