An immigration raid on a Hyundai electric vehicle plant in the US that saw hundreds of South Korean engineers detained in shackles has triggered “a major diplomatic incident” and shaken Seoul’s confidence in Washington’s commitment to their alliance, analysts say.US officials said 475 people – most of them South Korean nationals – were detained when federal agents raided Hyundai’s manufacturing site in the state of Georgia last Thursday.It is the latest in a long line of workplace raids...