South Korea claims it has a plan to annihilate the North Korean capital if it shows any signs of mounting a nuclear attack, according to reports from Seoul. <br/><br/>A military source told the Yonhap news agency every part of Pyongyang will be completely destroyed by ballistic missiles and high-explosives shells. Yonhap has close ties to South Korea's government and is publicly funded. On Friday, North Korea carried out what it said was its fifth, and largest, nuclear test. <br/><br/>The international community is considering its response. The US says it is considering its own sanctions, in addition to any imposed by the UN Security Council, Japan and South Korea.<br/>Pyongyang responded today by calling the threats of "meaningless sanctions… highly laughable".