North Korean leader Kim Jong-un, front, watched the regime's new tactical guided missile firing on Tuesday, according to the Korean Central News Agency, Wednesday. Yonhap

North Korean leader Kim Jong-un said this week's missile launches were an "adequate warning" against the joint military exercise between South Korea and the United States that kicked off earlier this week, state media reported Wednesday.

On Tuesday, North Korea fired two projectiles believed to be short-range ballistic missiles into the East Sea, the fourth such launch in less than two weeks. They flew about 450 kilometers across the northern part of the Korean Peninsula, according to the Joint Chiefs of Staff (JCS).

"Two tactical guided missiles launched at the operational airfield in the western area of the country flew across the sky over the capital area and the central inland region of the country to precisely hit the targeted islet in the East Sea," the Korean Central News Agency (KCNA) said.

After watching the launches, Kim said its "military action would be an occasion to send an adequate warning to the joint military drill now under way," according to the KCNA.