SEOUL, South Korea — The Trump administration on Tuesday confirmed North Korea’s claim that it had launched an intercontinental ballistic missile, and it told Pyongyang that the United States would use “the full range of capabilities at our disposal against the growing threat.”

The administration followed up that warning on Wednesday morning with a joint military exercise in which United States and South Korean forces fired ballistic missiles in the waters along the Korean Peninsula’s east coast.

But North Korea reaffirmed Wednesday that it would never deviate from its determination to bolster its nuclear and missile abilities as long as the United States’ “hostile policy” and “nuclear threat” persisted.

The North’s state-run Korean Central News Agency said its new intercontinental ballistic missile, the Hwasong-14, was capable of hitting the “heart of the United States” with “large heavy nuclear warheads.” The launch, according to the agency, successfully tested the functions of the missile’s two propulsive stages and the warhead’s ability to endure the intense heat and vibrations as it entered the earth’s atmosphere.