North Korean leader Kim Jong Un on Tuesday observed a test-launch of “new-type tactical guided missiles,” the country’s state media reported on Wednesday, in what he described as a “warning” to South Korea and the U.S. as they conduct a series of joint military drills this week.

Kim “watched the demonstration fire of new-type tactical guided missiles at daybreak Tuesday” at an observation post alongside top officials, the state-run Korean Central News Agency (KCNA) and the party daily Rodong Sinmun said.

South Korea’s Joint Chiefs of Staff (JCS) on Tuesday morning reported North Korea had fired two short-range ballistic missiles (SRBM)