To defend itself or its allies, the US President Donald Trump has told the UN General Assembly that America would destroy North Korea if they had to.
In his debut speech, he mocked North Korea’s leader, Kim Jong-un, saying: “Rocket man is on a suicide mission.”
North Korea has tested nuclear bombs and missiles in defiance of the UN.
Just before Mr Trump spoke, UN Secretary General Antonio Guterres had urged statesmanship, saying: “We must not sleepwalk our way into war.”
The American leader also attacked Iran, saying it was a “corrupt dictatorship” which was intent on destabilising the Middle East.
He called on the government in Tehran to cease supporting terrorism and again criticised the Obama-era international agreement over Iran’s nuclear programme, which he called an embarrassment.
Washington has repeatedly warned North Korea over its weapons tests, which violate UN Security Council resolutions.
The crisis worsened last month when the North announced plans to test missiles around the US Pacific territory of Guam.
“If [the US] is forced to defend itself or its allies, we will have no choice but to totally destroy North Korea,” Mr Trump said.