In an unprecedented personal statement, Mr. Kim said Mr. Trump would “pay dearly” for a United Nations speech where he threatened to “totally destroy” the North Korea if the U.S was forced to defend itself.
Mr. Trump responded that the “madman will be tested like never before.”
The two countries have engaged in ever more heated rhetoric in recent months, the BBC reports.
Mr. Kim ended his statement by saying he would “surely and definitely tame the mentally deranged U.S dotard with fire.”
China responded to the war of words, warning that the situation was “complicated and sensitive.
“All relevant parties should exercise restraint instead of provoking each other,” said Foreign Ministry spokesman, Lu Kang.
Russia also urged restraint. Kremlin spokesman Dmitry Peskov said Moscow was “deeply concerned by an escalation of tensions”.