End 'business as usual' with North Korea, U.S. tells China

By Lesley Wroughton and Ju-min Park WASHINGTON/SEOUL (Reuters) - The United States called on China on Thursday to end "business as usual" with its ally North Korea after Pyongyang defied world powers by announcing it had tested a hydrogen bomb. U.S. Secretary of State John Kerry said he made clear in a phone call with Chinese Foreign Minister Wang Yi that China's approach to North Korea has not succeeded. "China had a particular approach that it wanted to make, that we agreed and respected to gi