North Korea fired two cruise missiles off its west coast into the Yellow Sea early Wednesday, a South Korean military source told Yonhap news agency.
The alleged missile test coincided with a press conference by South Korean President Yoon Suk-yeol, marking 100 days since taking office.
It also came a day after South Korean and US troops launched preliminary drills ahead of the upcoming annual Ulchi Freedom Shield (UFS) war games.
Pyongyang has repeatedly criticized the joint military maneuvers between Seoul and Washington, calling them provocative and saying they only heighten tensions on the Korean peninsula.
North Korea is banned from launching ballistic missiles under UN Security Council resolutions, but the sanctions do not cover cruise missiles.
According to Yonhap, Pyongyang last tested cruise missiles in January.
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