In September Kim described Trump as a mentally deranged USA dotard - a word used to refer to a weak and senile old person - whom he would tame with fire.
In this undated photo distributed on September 16, 2017, by the North Korean government, leader Kim Jong Un, center, celebrates what was said to be the test launch of an intermediate range Hwasong-12 missile at an undisclosed location in North Korea.
Visiting Asia, the president has tried to bring the world together in pressurising North Korea's nuclear weapons programme, something that's proving somewhat of a tough task. It's all documented. With President Donald Trump, some people do think that his Twitter and overall personality could make a nuclear exchange more likely.
The threat of conflict between Kim Jong-un's nuclear-armed North and the South, backed by Donald Trump, has been looming over the Korean Peninsula for months.
Trump goes on to say sarcastically, "Oh well, I try so hard to be his friend - and maybe someday that will happen!"
The Asian giant is keeping the economically unstable nation financially afloat, and Trump has claimed China "can fix this problem easily - and quickly" by using its influence over the hermit state. The ministry was reacting to Trump's speech in South Korea last week, in which the president warned North Korea not to test the resolve of the USA and its allies.
North Korea has conducted dozens of ballistic missile tests in defiance of United Nations sanctions. I have never been more certain of anything.
In the meantime, the 25 million inhabitants of the South Korean capital, Seoul would be in grave danger from the enemy to the north and that U.S. and allied forces would be "subject to attack by conventional or chemical weapons" which would further delay their entry into the war.
And in a warning directed at young dictator Kim, he said: "The weapons you are acquiring are not making you safer".
"Strange things happen in life".
Asked at news conference with Vietnam's president later Sunday if he could become friends with the North Korean leader, Trump replied it "might be a odd thing to happen but it's certainly a possibility".
"Every step you take down this dark path increases the peril you face". "If that did happen, it would be a good thing for, I can tell you, for North Korea. I don't know if it will but it would be very, very nice".
That includes a stern speech delivered in South Korea's National Assembly on Tuesday, in which he said: "Do not underestimate us".