Seoul, South Korea (CNN) North Korea launched two suspected "short-range missiles" on Thursday, adding yet another complication into Pyongyang's stalled negotiations with the United States and peace talks with South Korea.

The missiles were launched at 4:29 p.m. local (3.29 a.m. ET) and 4:49 p.m. local, and flew eastward, reaching flight ranges of 420 kilometers (260 miles) and 270 kilometers respectively, according to a statement from South Korea's Joint Chiefs of Staffs.

They were launched from Kusong in North Korea's northwest, said South Korea's Defense Ministry, which also told CNN that the missiles had an altitude of around 50 kilometers and landed in the East Sea, also known as the Sea of Japan.

According to North Korean state news agency KCNA, Kim Jong Un himself oversaw the launches, which were designed to test the military's "rapid reaction" ability. The young leader reportedly expressed satisfaction with the drill and stressed "the need to further increase the capability" of North Korean armed forces on its forefront and western front.

The US Department of Defense confirmed the missile launches to CNN.

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