SEOUL, South Korea — It’s been an unusually quiet quarter for North Korea, which has avoided the occasional exchange of bellicose bluster with the US and South Korea, and has not tested a much-prophesized fourth nuclear bomb. But for the past month, a curious string of events has stirred up questions over whether changes are underway…

North Korean leader Kim Jong Un isn’t in his country’s capital city as rumors swirl about his health and a possible coup attempt as Kim hasn’t been seen publicly in more than a month. At least that’s the belief of South Korea’s defense minister. “As far as I know, [Kim] is staying at a certain place…