North Korea's latest missile test places Washington within range, South Korea said on Friday, but the North still needs to prove critical missile technology.

South Korea said it expected Pyongyang to pause its provocative missile testing program following Wednesday's successful flight of its new Hwasong-15 missile, which can reach the U.S. mainland.

Pyongyang has said the test was a "breakthrough." Leader Kim Jong Un said the country had "finally realized the great historic cause of completing the state nuclear force."