Japanese, American and South Korean officials discussed North Korea on Thursday in Hawaii and agreed to take resolute steps in the event of another nuclear test by Pyongyang.

U.S. national security adviser Jake Sullivan and his Japanese and South Korean counterparts, Takeo Akiba and Kim Sung Han, "agreed that there must not be naive thinking or reaction that North Korea has conducted six nuclear tests and that (a new test) will only be one more nuclear test," Kim told reporters, according to South Korea's Yonhap News Agency.

"Should North Korea conduct its seventh nuclear test, our reaction will certainly be different from those until now," the South Korean official added, saying trilateral cooperation will be "maximized" so the North realizes conducting a seventh nuclear test was the "wrong decision."