The rejection of an arrest warrant for South Korea’s impeached president Yoon Suk-yeol’s top official by a court in Seoul has delivered a major setback to prosecutors investigating Yoon’s martial law fiasco, observers said.Former prime minister Han Duck-soo avoided pre-trial detention after the Seoul Central District Court late on Wednesday dismissed a request from Special Prosecutor Cho Eun-seok’s team to place him in custody.Cho’s team, which is investigating Yoon’s short-lived December 3...