Meanwhile the South Korean military plans to beef up security in the waters near its maritime border with North Korea.
Reports indicate the South Korean Navy will conduct more anti-submarine drills in the West Sea where a warship sank in March. claiming the lives of 46 sailors.
Seoul's National Defense Ministry also plans to request government funds to improve underwater surveillance by modernizing sonar devices and naval radar systems.
And more joint anti-submarine warfare exercises between South Korean and US forces could take place in the East and West Seas.
In a report to President Lee Myung-bak South Korean defense chief Kim Tae-young acknowledged that there was a security loophole when the ship, according to him, was "ambushed."
He added March 26, the day of the sinking will be remembered by the South Korean military as a "day of infamy."