A letter from the RoK arrived in the offices of Mexico, which holds the current council presidency.

Ambassador Claude Heller, Security Council president from Mexico, said the RoK delivered a letter requesting the body take action.

He said the letter will be circulated to council members and the council will respond appropriately after consulting with other members.

The RoK investigated the incident and says a DPRK’s mini-sub fired torpedoes at the Cheonan naval ship and killed 46 people. The DPRK denies it attacked the vessel and called the probe a farce.

The RoK’s President Lee Myung-bak, who announced the move in Singapore at a security conference, said the DPRK "must admit its wrongdoing. It must pledge to never again engage in such reprehensible action."

"If we think that after a while the DPRK's action will be condoned and that stability on the Korean Peninsula will somehow be maintained then we would be foolling ourselves because the DPRK would once again resort back to attacking others."