And if North Korean troops advance quickly into major cities in the South much America's air power would be negated for fear of killing civilians with strikes, he said. But it's rare for a North Korean soldier to defect via the Joint Security Area, where border guards of the rival Koreas stand facing each other just metres away, and be shot by fellow North Korean soldiers.
The soldier crossed to South Korea from the North Korean side of the heavily guarded Joint Security Area (JSA) to Freedom House in the South, according to the JCS.
He was shot in the shoulder and elbow and was taken to a South Korean hospital, the Defence Ministry said.
Moon also asked for ASEAN countries' continued support for efforts to rid North Korea of its nuclear ambition.
South Korean companies with Chinese customers had suffered due to backlash from China, which has vehemently opposed the deployment of the Terminal High Altitude Area Defense (THAAD) system. The last time a soldier crossed was in 2007, and before that in 1998.
The soldiers would have to contend with artillery and rocket bombardments and should 'expect' attacks with chemical and nuclear weapons as well, he wrote in a letter seen by Newsweek.
A North Korean soldier defected to the South through the demilitarized zone in Gangwon last June. More than a million mines are buried inside the zone.
The number of North Koreans defecting to South Korea in the first two-thirds of this year dropped by 13% compared with 2016.
Moon agreed to visit Beijing at the invitation of Xi, and in return invited Xi to the opening ceremony of the 2018 PyeongChang Winter Olympic Games in February. After that assassination, and the 1961 Russian scenario, and a final lessening of tensions by Russia, Cuba and the United States, there were interesting sections in Cuba and the U.S.to handle issues. The American arrived in South Korea on Friday, according to the Yonhap news agency.
The UN Security Council has unanimously ratcheted up sanctions on North Korea over its nuclear and ballistic missile programs since 2006.