During his news conference at the United Nations headquarters on Tuesday, North Korean Ambassador Kim Song urged the U.S.to return the vessel.
The North Korean editorial comes after Biden repeatedly slammed the North Korean leader - who has dramatically improved relations with the USA under President Donald Trump's administration - in recent campaign rallies. The Rodong Sinmun on Saturday urged North Korean farmers to meet state goals in food production in face of "hostile forces who don't want us to become prosperous and ... are seeking to make our people undergo shortage of food, bring to collapse their faith in socialism".
The country's official state news agency released a statement that said Biden was "an imbecile bereft of elementary quality as a human being".
The state news agency further accused Biden of insulting the country's leadership and engaging in an "intolerable and serious politically-motivated provocation" against the North.
"[Biden] reeled off rhetoric slandering the supreme leadership of the DPRK", KCNA said, using the acronym for North Korea's official name.
The KCNA on Tuesday hit back, deriding his current bid for the U.S. Presidency as "enough to make a cat laugh". Kim Song, the North's permanent representative at the United Nations, urged the U.S.to return the ship on Tuesday in a rare news conference at the United Nations headquarters in NY.
It isn't the first time North Korean media have weighed in during a Trump presidential run.
Why is North Korea criticising Joe Biden?
In a rare press conference at the UN in NY on Tuesday, North Korea's UN Ambassador Kim Song demanded immediate return of the country's second-largest cargo ship, the Wise Honest, and warned the U.S. of consequences on the future of its relations with Pyongyang.
The vessel - a 17,061-ton, single-hull bulk carrier, one of North Korea's largest - was detained by Indonesia's maritime authorities in April 2018 and is now in the custody of the United States, according to the department and a US official.
Denuclearisation talks have stalled since the breakdown of the second meeting between Trump and Kim in February and North Korea conducted more weapons tests this month.
The Republican leader claimed the North Korean side overstepped by wanting all sanctions lifted, an account disputed by Pyongyang's team, which argued that it only sought partial relief and that the discussions were derailed when hawkish White House national adviser John Bolton showed up.
"We will carefully watch every move of the United States", said Kim.