It comes a day after North Korea fired a ballistic missile over Japan.

The U.S. Missile Defense Agency (MDA) and the Navy successfully conducted a missile defence test off the coast of Hawaii, the former said in a statement on August 30.

The test, scheduled well in advance, was done from USS John Paul Jones and comes a day after North Korea fired a ballistic missile over Japan. The test, using Standard Missile-6 guided missiles, intercepted a medium-range ballistic missile target.

North Korea said its missile launch was to counter U.S. and South Korean military drills, and was a first step in military action in the Pacific to “contain” the U.S. territory of Guam. The launch was condemned by the United Nations as an “outrageous” act.

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The MDA said the test gives the naval component of the missile defence system higher ability to intercept ballistic missiles in their terminal phase.

Japan has been worried that the United States has so far declined to arm it with a powerful new radar.

Japan is seeking a land-based version of the Aegis ballistic missile defence system, operational by 2023, as a new layer of defense to help counter North Korea’s missile advances.