North Korea calls Biden 'rabid dog' that 'must be beaten to death'

Seoul: North Korea has launched a visceral diatribe against US Democratic presidential candidate Joe Biden, calling the former vice-president a "rabid dog" -- while also borrowing the terminology of Donald Trump.

Pyongyang is renowned for its vitriol, but the verbal deluge was unusually ferocious even by its own standards.

Biden "had the temerity to dare slander the dignity of the supreme leadership of the DPRK", the North's official KCNA news agency said late Thursday, referring to the country by its official name.

"Rabid dogs like Biden can hurt lots of people if they are allowed to run about," it went on. "They must be beaten to death with a stick.

"Doing so will be beneficial for the US also," it added.

It was not immediately clear what had provoked Pyongyang's ire, but Biden's campaign released an ad this week condemning Trump's foreign policy, saying that "dictators and tyrants are praised, our allies pushed aside".

The voiceover says the word "tyrants" at the exact moment a picture appears of US President Donald Trump and North Korean leader Kim Jong Un shaking hands at their Singapore summit last year.

KCNA appeared to cite one of Trump's favoured insults for the candidate -- "Sleepy Joe" -- when it said Americans called him "Biden not awakened from a sleep".