An activists wearing a mask with an image of North Korean leader Kim Jong-Un is posing next to a Styrofoam effigy of a nuclear bomb while protesting outside the North Korean Embassy on September 13, 2017 in Berlin, Germany.

Omer Messinger | Getty Images

An activists wearing a mask with an image of North Korean leader Kim Jong-Un is posing next to a Styrofoam effigy of a nuclear bomb while protesting outside the North Korean Embassy on September 13, 2017 in Berlin, Germany.

North Korean Minister of Foreign Affairs Ri Yong Ho said that his country may consider a test of a hydrogen bomb in the Pacific Ocean, according to a report from South Korea’s official news agency Yonhap.

Ri said the potential test of “the most powerful detonation of an H-bomb” would be one possible “highest-level” action against the U.S., according to the report.

He added that he didn’t know what actions would be ordered by Kim Jong-un, Yonhap reported.

The news immediately sent the Japanese yen higher. Despite Japan’s proximity to North Korea, its currency regularly benefits when investor anxiety suddenly rises.

The dollar was fetching as much as 112.55 yen before the news, but fell as low as 112.15 yen afterward.

South Korea’s currency, the won, came under pressure. The dollar was fetching as much as 1,134.50 won after the news, compared with as little as 1,131.28 won earlier.

Ri’s reported comments followed a statement from Kim chastising President Donald Trump, calling the president’s United Nations address earlier this week “unprecedented rude nonsense.”

Early Friday, Kim said that the president’s remarks at the U.N. merit the “highest level of hard-line countermeasure in history.” The dictator said he is “thinking hard” about what kind of reaction Trump could have possibly expected when he delivered those remarks.

“The mentally deranged behavior of the U.S. president openly expressing on the U.N. arena the unethical will to ‘totally destroy’ a sovereign state, beyond the boundary of threats of regime change or overturn of social system, makes even those with normal thinking faculty think about discretion and composure,” Kim said in a statement circulated on state news agency KCNA.

Kim urged the president to “exercise prudence in selecting words” after Trump on Tuesday issued a harsh warning to Pyongyang. The president threatened to “destroy” the communist nation if it threatened the United States.

Pyongyang’s response comes hours after Trump signed an executive order that aims to expand his authority to target people and institutions doing business with North Korea. The measure seeks to cut off North Korea’s access to funding and deter its nuclear and missile programs.

In recent weeks, North Korea has tested ballistic missiles and an apparent hydrogen bomb in the face of international economic sanctions and warnings. Last week, the U.N. unanimously passed fresh measures to punish the isolated nation economically, with the support of China and Russia.

—CNBC’s Jacob Pramuk contributed to this article.

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