North Korea on Friday threatened a “terrible response” if it detects any more drones buzzing across the border from the South. South Korean President Lee Jae Myung has sought to repair ties with North Korea since taking office last year, criticising his predecessor for allegedly sending drones to scatter propaganda over Pyongyang. But North Korea said it shot down a surveillance drone just last month, an incident which threatens to blight Lee’s efforts to patch things up. Kim Yo-jong, the...