North orea fired a ballistic missile over the northern Japanese island of Hokaido on Friday, CNN reported.
According to analysts, the move is a major show of Pyongyang's defiance of the international community.
The move comes after tough new United Nations sanctions against the nuclear state.
In response to the move, South Korea launched a Hymunmu-2 missile off its volatile neighbor's coast.
Seoul's Defense Minister Lee Myung Jae said his country's response came after Pyongyang's provocative missile agaisnt Japan.
Further details will be released soon.