On 25 May 2009, Malaysian Navy and coastguards at the Ambalat were ordered to leave Ambalat waters by the Indonesian corvette . Malaysian fast-attack vessel KD Yu-3508 (Malaysian navy boat) on 04.03.00 LU/118.01.70 East Longitude position, and entered Indonesia territory at , clearly violating the UNCLOS on sea border territory.
On May 25, 2009, Malaysian Navy and coastguards were ordered to leave Ambalat waters by the Indonesian corvette. The fast-attack vessel KD Yu-3508 (Malaysian navy boat) entered Indonesia's territory at longitude 118.017 East on March 4, 2000, which was a violation of UNCLOS concerning maritime boundaries.