Donald Trump is in South Korea for the second leg of his Asia tour in which the US President is set to meet four key nations in a bid to present a united front against North Korea.
North Korea has been accelerating its threats towards the United States and has increased its testing of nuclear weapons.
Speaking on the Today programme, host, Justin Webb reported from the front line in South Korea and claimed that Mr Trump was in the “firing line”.
He said: “A war that begins in Korea would be a catastrophe for millions on this peninsula, but of course, it might not end here.
“China is committed to defending North Korea, Russia could get involved, there is a real danger of world conflagration.
“For the first time in his presidency, Donald Trump is, himself, in North Korea’s firing line.”
Webb also quizzed an unnamed General in the South Korean army about the “good cop, bad cop, double act” deployed by President Trump and Rex Tillerson was going to work.
He said: “Trump and Tillerson are a good combination. Tillerson wants conversation but Trump doesn’t.
“It may seem a mismatch, but I think it is a well-planned strategy.
“Therefore if North Korea and China do not accept America’s terms it will execute a military option.”
Hours before the US President landed in South Korea, the North threatened “merciless retaliation” following Mr Trump’s comments in Japan.
Speaking in Tokyo, the US President said: “We are working to counter the dangerous aggressions of the regime in North Korea.
“The regime continues development of its unlawful weapons programs, including its illegal nuclear tests and outrageous launches of ballistic missiles directly over Japanese territory, are a threat to the civilised world and international peace and stability.
“We will not stand for that: the era of strategic patience is over.”
After arriving in South Korea, Mr Trump said he planned to talk about trade, as well as the North Korea crisis.
He said: “There is great cooperation.
“We have a terrific meeting scheduled on trade in a little while with President Moon and his representatives.
“And hopefully that will start working out and working out so that we create a lot of jobs in the United States which is one of the reasons that I’m here.”
They will also discuss how to maintain the 28,500 US troops stationed in South Korea, which is said to be a costly measure despite tensions with the North.