North Korea launched a ballistic missile into the Sea of Japan on Wednesday.

According to the South Korean military, the missile traveled a relatively short distance at a relatively low altitude. It does not appear to have come close to Japan. The low altitude suggests the test was focused on testing the missile’s boost phase engine performance. Nevertheless, Yonhap reports that analysts believe the test did involve a Hwasong-15 intercontinental ballistic missile. The first North Korean missile potentially capable of reaching the U.S. mainland, the missile serves as the centerpiece of Kim Jong Un’s nuclear force.

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