The Joint Chiefs of Staff (JCS) said a short-range ballistic missile was launched from the Jangyon area in South Hwanghae Province at around 5:05 a.m. in a northeast direction. Another unidentified ballistic missile was launched around 5:15 a.m.

He did not provide further details, such as the distance at which the missiles flew, the Yonhap news agency reported.

"As we strengthen our monitoring and surveillance against additional launches, our military maintains a posture of full readiness while sharing North Korean ballistic missile data with US and Japanese authorities," the JCS told media.

On Sunday, North Korea's Foreign Ministry denounced the three-day multi-domain "Freedom Shield" exercise, saying the country would take "offensive and overwhelming" countermeasures against what it called an attempt to strengthen a military bloc.

Fighter jets and warships, including a U.S. aircraft carrier, participated in the exercises, which ended Saturday.

The latest launch came five days after North Korea fired a ballistic missile into the East Sea on Wednesday.

North Korea claimed the next day to have successfully conducted a multiple-warhead missile test, but South Korea dismissed the claim as a "hoax," saying the launch failed when the missile exploded in midair.

North Korea has raised cross-border tensions in recent weeks, launching garbage balloons into South Korea in a tit-for-tat measure against anti-Pyongyang leaflets sent by North Korean defectors and activists in South Korea.

The latest launch also came amid growing concerns about deepening military cooperation between Pyongyang and Moscow after North Korean leader Kim Jong-un and Russian President Vladimir Putin signed a "comprehensive strategic partnership" treaty during a summit. last month in Pyongyang.

The pact includes a commitment that the two countries will help each other if they are attacked.