hanoi u.s. president donald trump say tweet sunday north korean leader kim jong un insult call old say would never call kim short fat trump make comment attend asia-pacific economic cooperation apec summit vietnam series tweet also say chinese president xi jinping up sanction north korea response nuclear missile program xi want pyongyang denuclearize trump visit beijing last week xi reiterate china would strive denuclearization korean peninsula offer hint would change tack north korea fight side side 1950-53 korean war u.s.-led force one trump tweet read would kim jong-un insult call old would never call short fat oh well try hard friend maybe someday happen speak late vietnam capital hanoi trump say would nice kim become friends might strange thing happen possibility say trump trade insult threats kim past amid escalate tension pyongyang nuclear missile program north korea race toward goal develop nuclear-tipped missile capable reach unite state -something trump vow prevent north korea conduct sixth powerful nuclear bomb test sept. prompt another round u.n. sanction september kim describe trump mentally derange u.s. dotard would tame fire comment come trump threaten maiden unite nations address totally destroy country 26 million people unite state threaten north korea foreign minister ri yong ho address u.n. general assembly september trump tweet hear foreign minister north korea speak u.n. echo thoughts little rocket man around much long north korea conduct dozens ballistic missile test defiance u.n. sanction vow never give weapons program say necessary counter hostility unite state ally unite state say options include military table although preference diplomatic solution trump say north korea 's kim insult call 'old