Russian President Vladimir Putin has gifted North Korean leader Kim Jong Un a Russian-made car for his personal use in a demonstration of their special relationship, North Korea's state media reported Tuesday.

The report didn't say what kind of vehicle it was or how it was shipped. But observers said it could violate a U.N. resolution that bans supplying luxury items to North Korea in an attempt to pressure the country to abandon its nuclear weapons.

Kim's sister, Kim Yo Jong, and another North Korean official accepted the gift Sunday and she conveyed her brother's thanks to Putin, the Korean Central News Agency said. Kim Yo Jong said the gift showed the special personal relationship between the leaders, the report said.

North Korea and Russia have boosted their cooperation significantly since Kim traveled to Russia last September for a summit with Putin. During Kim's visit to Russia's main spaceport, Putin showed the North Korean leader his personal Anrus Senat limousine and Kim sat in its backseat.

According to Russia's state-run Tass news agency, Aurus was the first Russian luxury car brand and it's been used in the motorcades of top officials including Putin since he first used an Anrus limousine during his inauguration ceremony in 2018.