Because the U.S. president was speaking publicly on the world stage at the UN, Kim thought he'd resort to "stereo-typed, prepared remarks a little different from what he used to utter in his office on the spur of the moment".
The statement stressed Kim was in no mood to change course. North Korea later fired a ballistic missile over Japan and the US military flew powerful bombers and stealth fighter jets over the Korean Peninsula and near Japan in a show of force against the North.
The exchange of super-heated rhetoric and unusually personal abuse between the adversaries will escalate tensions that have been mounting as North Korea has marched closer to achieving a nuclear-tipped missile that could strike America. The Trump administration is doing a better job in this regard: it is strengthening its forces in the area; reinforcing its allies' defences; and making clear that any decision by North Korea either to launch a nuclear attack, or to use its nuclear weapons to deter an American response to a conventional attack, would have enormous consequences. "We can not deny the possibility it may fly over our country", Onodera said.
It's not the first time North Korea has resorted to insults when delivering statements about its enemies. "No one has done an above-ground test in decades", he said.
The latest threats of a bomb-and-missile test coming out of Pyongyang, as NPR's Geoff Brumfiel reported earlier this month, raises the specter not seen since the height of the Cold War. "It is truly terrifying if something goes wrong".More news: Dani Ceballos Brace Leads Real Madrid Past Deportivo Alaves in La Liga
For practical reasons - the impossibility of paying out, being one - you can't bet on whether or not the end of the world is nigh, but the rhetoric from worldwide leaders this week means nuclear war feels more likely now than it has for decades.
With improving technology and constant threats from North Korea, State officials say the best option to stay alive during an attack is the action you take right now.
Kim's statement was in response to Trump's combative speech at the U.N. General Assembly on Tuesday in which he mocked Kim as "Rocket Man" on a "suicide mission" and said that if "forced to defend itself or its allies, we will have no choice but to totally destroy North Korea".
Kim said Trump was "unfit to hold the prerogative of supreme command of a country". He also said he would "tame the mentally deranged US dotard with fire".
The Yonhap news agency said the foreign minister added: "We have no idea about what actions could be taken as it will be ordered by leader Kim Jong Un".
The "dotard" vs. "madman" war of words follows Trump's announcement of a new set of sanctions against North Korea on Thursday. Last week, China announced that its central banks would stop doing business with the country.
The order comes shortly after the U.N. Security Council, with China's cooperation, approved a resolution limiting trade with North Korea. Trump has said he won't allow it, although the U.S.so far has not used military force to impede the North's progress.