Two cruise missiles were fired by North Korea off the Yellow Sea coast, according to Yonhap news agency.
An alleged missile attack occurred at the same time as a South Korean president Yoon Suk-yeol’s press conference, which marked 100 days since his election.
The drill also took place a day before US and South Korean troops conducted preliminary drills in preparation for the annual Ulchi Freedom Shield wargames (UFS).
Pyongyang has repeatedly condemned joint military maneuvers between Seoul, Washington. It called them provocative and claimed they only increase tensions in the Korean Peninsula.
North Korea is banned from launching ballistic missiles under UN Security Council resolutions, but the sanctions don’t cover cruise missiles.
Yonhap reports that Pyongyang tested cruise missiles last January.
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