Japan's military said the missile landed in waters outside its exclusive economic zone, while South Korea's military, which often accuses the North of exaggerating its capabilities, said it travelled more than 700 kilometres.
North Korea in recent years has added mines, anti-tank barriers and other front-line fortifications, raising concerns in the South about the growing presence of North Korean soldiers near the border.
In August, Trump told reporters that North Korean leader Kim Jong-un had "57 very powerful nuclear weapons" as he once again touted the pair's relationship.
Trump announced in August that he intended to meet with North Korean leader Kim Jong-un later this year as he once again touted the pair's relationship. Pyongyang has offered little response.