North Korea is threatening to resume insults of President Donald Trump and consider him a “dotard” if he keeps using provocative language, such as referring to its leader as “rocket man”. Choe Son Hui – the first vice-foreign minister – issued the warning via state media days after Trump spoke of possible military action toward the North and revived his “rocket man” nickname for North Korean ruler Kim Jong Un. The comments come as prospects dim for a resumption of nuclear diplomacy between the two countries. In recent months, North Korea has hinted at lifting its moratoirum on nuclear and long-range missle tests.