North Korea conducted what has been referred to by experts as their “most successful” missile test to date on Sunday, demonstrating their ability to strike U.S. bases as far away as Guam with a hypothetically nuclear tipped missile.

Kim Jong Un is said to have personally supervised the launch of the Hwasong-12 missile, a never before tested iteration of North Korea’s ballistic missile program, and feasibly a significant stepping stone toward the development of a true Intercontinental Ballistic Missile capable of striking the mainland United States.

According to state-owned news outlet KCNA, Sunday’s test was “aimed at verifying the tactical and technological specifications of the newly developed ballistic rocket capable of carrying a large-size heavy nuclear warhead.”

KCNA went on to report that the Hwasong-12 reached a maximum altitude of 2,111.5 kilometers (or 1,312 miles) above the surface of the earth before re-entering the atmosphere and impacting a predesignated target 787 kilometers (489 miles) away.