SEOUL, South Korea (AP) — North Korea fired suspected short-range ballistic missiles off its east coast on Friday, South Korea’s military said, a day after South Korea and the U.S. flew powerful fighter jets in a joint drill that the North views as a major security threat.

South Korea’s Joint Chiefs of Staff said the weapons launched from the North’s east coast Wonsan region traveled about 300 kilometers (185 miles) before landing in the waters between the Korean Peninsula and Japan. Japan’s Chief Cabinet Secretary Yoshimasa Hayashi said a North Korean missile landed outside Japan’s exclusive economic zone.

South Korea’s Joint Chiefs of Staff statement called the launches “a clear provocation” that threatens peace on the Korean Peninsula. It said South Korea will maintain a firm readiness to repel potential aggressions by North Korea in conjunctions with the military alliance with the United States.