Trump said North Korea went too far when calling former US Vice President Joe Biden "a rabid dog in need of extermination".

"Joe Biden may be sleepy and very slow but he is not a 'rabid dog'. He is really better than that," Trump wrote on Twitter on November 17. It is not clear whether Trump is sincerely or sarcastically defending Biden, the Democratic presidential candidate - his formidable opponent in next year's election.

North Korea 's Central News Agency (KCNA) published an article on November 14 that "Joe Biden offended the dignity of the North Korean leader" and "wild dogs like Biden could hurt a lot. people if they are released ".

It's not clear why North Korea was angry at Biden, but Biden's campaign last week used the image of Kim Jong-un when condemning President Trump's foreign policy. The ad states that "dictators and tyrants are praised, while our allies are being brushed aside", accompanied by a picture of Trump shaking hands with Kim Jong-un at the summit. United States - First Dynasty in Singapore in 2018.

This is not the first time Pyongyang has harsh words with Biden. In May, the company called him a "fool", "a low-IQ idiot", in response to his calling Kim Jong-un "dictator" and "tyrant". However, observers say that the words North Korea launched with Biden this time is "fierce unprecedented".