But North Korea has reacted angrily saying, "the worst crime for which he [Trump] can never be pardoned is that he dared [to] malignantly hurt the dignity of the supreme leadership".
Trump was also called "an old slave of money" - there's that word "old" again - who "will be forced to pay dearly for his blasphemy any moment". During his visit to Vietnam trump said he has tried to befriend Kim Jong.
Donald Trump is likely to return home and say he has had a great trip to Asia.
North Korea's state media has criticized United States President Donald Trump's latest Asia tour, calling him a "destroyer of world peace". It repeated the idea that North Koreans won't cower in front of a "rabid dog's barking" and that Trump's hostility represents a "declaration of war". The statement also criticised the "reckless remarks by an old lunatic like Trump will never scare us or stop our advance". "Every step you take down this dark path increases the peril you face".More news: Delta Air Lines, Inc. (DAL): Scrutinizing the Chart
More news: Testimony: Fox Sports involved in soccer bribes
More news: UN Chief raises concern over Rohingya crisis at ASEAN
Arriving in Seoul on Tuesday, U.S. special representative for North Korea policy Joseph Yun told the local press he was not sure whether North Korea's break from nuclear testing would last, but he thought it was a "good start".
Cyber operations in North Korea have been conducted to collect sensitive political and military intelligence information in order to attack their enemies.
Trump's descriptions of North Korea's current leader have varied, and he has even been positive at times - describing him as a "pretty smart cookie" in April.
President Trump is now in the Philippines for the ASEAN Summit, the last leg of his Asia tour.
In recent years, North Korea has also insulted former secretaries of state John F. Kerry ("hideous lantern jaw") and Hillary Clinton (both a "schoolgirl" and a "pensioner"), while the entire administration of President George W Bush was referred to as "a bunch of tricksters and political imbeciles".
She said she was protesting against Mr Trump's attitude to women and his failure to meet with human rights activists in Vietnam.