Big foreign policy problems have been slowly building up around South Korean President Moon Jae-in.

North Korea has viciously insulted him while conducting missile test after missile test. Japanese Prime Minister Shinzo Abe has attacked him with trade restrictions. The U.S. has officially expressed strong concern and disappointment with Seoul’s decision to end GSOMIA (the General Security of Military Information Agreement between South Korea and Japan).

Out of these problems, the North’s insults have got to hurt the most. Pyongyang has ridiculed Mr. Moon as an “idiot,” a “scared dog,” and that comments made during his speech on Liberation Day on