SANTA FE, N.M. (Reuters) - U.S. diplomatic trouble-shooter Bill Richardson ended three-days of talks with a senior North Korean official on Saturday with a pledge the reclusive communist state will not develop nuclear weapons. Richardson, former U.S. ambassador to the United Nations and now the Democratic governor of New Mexico, said he now had hopes rising tensions could be solved peacefully through diplomacy. "The North Koreans told me that they don't plan to build nuclear weapons and I took that as a positive statement," Richardson told reporters after concluding almost nine hours of talks since Thursday with Han Song Ryol,...