Yoon Suk-yeol, South Korea's new president, presided over the meeting.
South Korea convened a National Security Council (NSC) meeting over North Korea's missile launch on Wednesday and "strongly condemned" the North's latest weapons test as a "grave provocation", the presidential office said.
Yoon Suk-yeol, South Korea's new president, presided over the meeting and ordered officials to take agreed steps to strengthen US deterrence, according to his office.
In a separate government statement, South Korea also said it had "strong and effective" responses ready to deal with any North Korea provocations.
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