evidence: North Korea’s army said it will take the "substantial military step" of completely cutting off its territory from South Korea on Wednesday, after months of fortifying its heavily armed border. [...] "If North Korea were to establish a new territorial clause through a constitutional amendment and sever its relationship with the South, the internal and external repercussions would be so great," Hong told CNN, suggesting Pyongyang is taking small steps in that direction. [...] The United Nations Command – a multinational military force tasked with securing the heavily fortified DMZ between the two Koreas – confirmed it had been contacted by the North Korean army but said it would not discuss the specific content of messages "out of consideration for the integrity of the hotline."