The South Korean Navy corvette Cheonan is torpedoed, killing 46 sailors. After an international investigation, the President of the United Nations Security Council blames North Korea.

ROKS Cheonan is the name of two South Korean Navy warships:

• ROKS Cheonan (PCC-772), a Pohang-class corvette from 1989 to 2010.
• ROKS Cheonan (FFG-826), a Daegu-class frigate commissioned in 2023.

The ROKS Cheonan sinking occurred on 26 March 2010, when Cheonan, a Pohang-class corvette of the Republic of Korea Navy, carrying 104 personnel, sank off the country's west coast near Baengnyeong Island in the Yellow Sea, killing 46 seamen. The cause of the sinking remains in dispute.

The presidency of the United Nations Security Council is responsible for leading the United Nations Security Council. It rotates among the fifteen member-states of the council monthly. The head of the country's delegation is known as the president of the United Nations Security Council. The presidency has rotated every month since its establishment in 1946, and the president serves to coordinate actions of the council, decide policy disputes, and sometimes functions as a diplomat or intermediary between conflicting groups.