Mongolia has invited Kim Jong Un to visit “at a comfortable time,” state-run media reported Sunday, less than two weeks after South Korean foreign minister Park Jin visited the country and called for more robust ties between Seoul and Ulaanbaatar.

The Korean Central News Agency (KCNA) said Sunday that President Ukhnaagiin Khurelsukh extended the request in a letter to the North Korean leader marking DPRK’s founding anniversary last week.