The information has been disclosed after a group of US Congressmen called for an assessment of possible fallout should military action commence.
A report by the Congressional Research Service released last month estimates that as many as 25 million people on either side of the border, including more than 100,000 US citizens, could be affected by an escalation of a military conflict on the Korean Peninsula.
"With that in mind, the thought of sending troops into harm's way and expending resources on another potentially unwinnable war is chilling".
Kim Jong Un's nuclear weapons program must be halted by diplomacy and not military action, South Korea's foreign minister told NBC News ahead of President Donald Trump's visit to the country. The president joined Japanese Prime Minister Shinzo Abe in Japan on Sunday and Monday, enjoying a casual burger lunch and golf - and discussing the nuclear crisis.
This contrasts with Trump, who has threatened the North with "fire and fury" and exchanged warlike rhetoric with North Korean leader Kim Jong Un.
'No dictator, no regime, no nation should ever underestimate American resolve, ' Trump told hundreds of cheering U.S. and Japanese troops in camouflage uniforms gathered at Yokota Air Base, just west of Tokyo, soon after he arrived.
"Every once in a while in the past, they underestimated us".
South Korea's spy agency told politicians yesterday that North Korea may be planning a new missile test, after brisk activity was spotted at its research facilities.
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Recent drills over South Korea by two USA strategic bombers have further raised tensions. While Trump will be looking to use his trip to strengthen Washington's alliance with Seoul and reaffirm their joint push to maximize pressure on North Korea over its nuclear program, he will also be faced with several thorny issues weighing on the relationship.
His administration also planned to take a different approach to dealing with the issue after years of what he termed "total weakness", although he did not give any details.
The US president, according to the newspaper, is "unstable".
North Korea has said in public statements that it wants an official end to the Korean War.
Beijing has pleaded with both the USA and Pyongyang to 'realize that resorting to military force will never be a viable way to resolve the peninsula issue and their own concerns, adding that 'War on the peninsula will have no victor'.
North and South Korea are technically still in a state of conflict since the Korean War ended in an armistice, rather than a peace treaty, in 1953. Those sanctioned were banned from having any trade deals with South Korea.