AP Photo

The North Korean mission to Cambodia sits on a major thoroughfare in the capital Phnom Penh, in the shadow of a lavish mansion belonging to the country’s Prime Minister Hun Sen. There are usually few signs of life behind the tinted windows of the pale pink embassy building, which only rarely admits visitors. Last month, however, the missionhosted a delegation from Pyongyang led by North Korean Deputy Trade Minister Ri Myong San. The official visit was relatively innocuous – Ri spoke with Cambodian officials about the expansion of economic ties – but the rare public appearance of a North Korean official underscored the curious friendship between Cambodia and the...