Korean Central News Agency
The country has vehemently denied having had any cases of the virus, a claim questioned by outside experts.
North Korea's latest moves will further set back South Korean President Moon Jae-in's push for inter-Korean reconciliation.
Twitter users compared the photos to scenes from "Shrek," "Narnia, "Game of Thrones" and even an Old Spice commercial.
Nuclear negotiations have been at a standstill since talks in February between North Korean leader Kim Jong Un and President Donald Trump broke down.
President Trump and the North Korean dictator continue to praise each other months after their failed summit.
Xi will meet with North Korean leader Kim Jong Un during the visit, CCTV announced.
Biden has accused President Donald Trump of cozying up to "dictators and tyrants" like Kim Jong Un and Russian President Vladimir Putin.
Pyongyang also said it plans to close down a former test site.