North Korea and America have been involved in a war of words in recent months, with Kim Jong-un threatening to attack the US with his nuclear programme.
Kim Jong-un’s regime would be "crushed" if it sparked a war with the US, military analyst Jack Keane has said.
Speaking on Fox News, Mr Keane said: "King Jong-un, once he makes a decision to react to what he believes is a provocation by the United States, and start a shooting war on the peninsula - that’s the end of his regime.
"And he knows that. All the people around him know that.
"We would crush that regime in a matter of days and he knows that."
Mr Keane said the US should prepare for war and get ammunition ready. He said: "If we are going to go to war, and there’s a possibility we are, director Pompeo of the CIA said we are just months away from the showdown.
"If that’s the case, as we are in Iraq and Afghanistan, we are an ocean away, which means we have to prepare theatre level logistics. We have to put in place ammunition. We have to start moving some forces that are going to be able to accommodate the reality of that."
Mr Keane also said Donald Trump should be making plans to bring the American population home.
He argued China and North Korea will not take the threats of military action seriously if the US continues to send families to South Korea with their military spouses.
He said: "I actually think we should do more on the military side to strengthen the policy change that we made dealing with North Korea and that is that the military option is back on the table."
In regard to North Korea’s recent diplomatic talks with South Korea, Mr Keane said Kim Jong-un is using the talks to drive a wedge between the US and South Korea.
Earlier this week US President Donald Trump deployed nuclear supercarrier USS Carl Vinson and three-nuclear capable B-2 bombers to Korean peninsula sea and Guam to monitor North Korea during the Winter Olympics taking place in Pyeongchang in February.
A medium-range missile was launched from the Pacific Missile Range Facility on Kauai, Hawaii, during a flight test on August 29.
The target was successfully blasted out of the sky by SM-6 missiles, which were fired from the USS John Paul Jones, one of the US Navy’s top destroyers.