Donald Trump has issued another warning to North Korea, during a speech delivered in Seoul yesterday.
The US President told the communist state: "Do not underestimate us and do not try us."
In comments directed to North Korean leader Kim Jong Un, Trump said: "The weapons that you are acquiring are not making you safer, they are putting your regime in grave danger. Every step you take down this dark path increases the peril you face."
He also called on countries around the world to isolate Pyongyang by denying it "any form of support, supply or acceptance".
In his speech to South Korea's National Assembly, Trump said North Korea is a "country ruled by a cult", and added: "We will not allow American cities to be threatened with destruction. We will not be intimidated.
"And we will not let the worst atrocities in history be repeated here, on this ground we fought and died to secure.
"The world cannot tolerate the menace of a rogue regime that threatens it with nuclear devastation."
Trump has used increasingly strong anti-North Korea rhetoric over recent months, and in September, he told the UN General Assembly that the US would "totally destroy" North Korea if it were to be attacked by Kim's regime. In the same speech to the UN, Trump referred to Kim as "rocket man".
The US President arrived in Beijing today, on his first state visit to China.