Bridge to nowhere shows China's failed efforts to engage North Korea

By Sue-Lin Wong DANDONG, China (Reuters) - Towering above the murky waters, the New Yalu River Bridge was supposed to symbolize a new era in relations between China and North Korea, helping bring investment to landmark free trade zones jointly run with the impoverished and isolated state. Launched with great fanfare at a five-star Beijing hotel in 2012, the free trade zones close to the Chinese border city of Dandong were meant to be part of China's efforts to coax its erstwhile diplomatic ally