Key China border city brushes off latest North Korea nuclear test

By Sue-Lin Wong DANDONG, China (Reuters) - Tourists and the odd train made their way across China's main border point with North Korea on Saturday, with residents largely brushing off Pyongyang's fifth and largest nuclear test and little sign of stepped up security or scrutiny. China, Pyongyang's main diplomatic ally, is key in any effort to rein in North Korea's nuclear program. While China says it is fully committed to enforcing the sanctions, it has also made clear it does not think ordinary