Donald Trump and North Korea
US President Donald Trump has been ridiculed by North Korea several times Reuters file photo

US President Donald Trump has begun to put Twitter's expanded 280-character limit to good use, mocking North Korean leader Kim Jong-un in one of his tweets after the social media giant's move to double the word limit.

Referring to Kim's ridicule of Trump by calling him a "dotard" – meaning a senile or old person – the American leader shot back with a tongue-in-cheek tweet early on Sunday, 12 November, saying that he would never call the North Korean supreme commander "fat and short".

Two months ago, Kim had originally called Trump a "dotard" as the two leaders have engaged in a war of words. But the Korean Central News Agency (KNCA), Pyongyang's state-run media outlet, repeated the offensive remark in a statement on Saturday, 11 November.

Responding to that, Trump wrote, "Why would Kim Jong-un insult me by calling me 'old', when I would NEVER call him 'short and fat'? Oh well, I try so hard to be his friend – and maybe someday that will happen."

The US president is currently in Vietnam as part of his 12-day-long Asia visit – which has been mostly dominated by threats emerging from the reclusive North Korean regime. Pyongyang has been keeping a close watch on Trump's tour and has frequently released statements criticising Washington and Trump.

"His current trip to our surrounding region is a warmonger's visit for confrontation to rid the DPRK [the Democratic People's Republic of Korea – North Korea's official name] of its self-defensive nuclear deterrence. It is also nothing but a business trip by a warmonger to enrich the monopolies of the US defence industry by milking the moneybags from its subordinate 'allies'," the KNCA said.

It went on, "The reckless remarks by a dotard like Trump can never frighten us or put a stop to our advance. This rather gives us an assured conviction that our choice to embark on the road of simultaneously promoting the economic construction and the up-building of the nuclear force was all the more a righteous one, and it pushes us to speed up the efforts to accomplish the great cause of completing the state nuclear force."