South Korea and the US launched eight missiles on Monday, in response to a volley of ballistic missiles fired by North Korea the previous day.
It comes as Pyongyang continues to escalate its missile tests.
South Korea's president Yoon Suk-yeol said his government would respond sternly to any provocation from its northern neighbour.
"We will make sure there isn't a single crack in protecting the lives and property of our people," he said.
Speaking at a war memorial event in Seoul, he added that North Korea's nuclear and missile programmes "are reaching the level of threatening not only peace on the Korean Peninsula but also in Northeast Asia and the world", according to Yonhap.
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