President Lee Jae Myung arrived in Ulaanbaatar on Thursday on a state visit that will include a bilateral summit with Mongolian President Ukhnaagiin Khurelsukh. Lee's trip marks the first state visit to Mongolia by a South Korean president in 15 years, as Seoul seeks to strengthen cooperation with the resource-rich country in supply chains, including those involving rare earths. On the first day of his three-day visit, Lee will hold a summit with the Mongolian president, during which the two lea