South Korean forces have carried out a drill aimed at repelling foreign landings on disputed islands at the heart of a row with Japan.
The drill took place at an outcrop known in South Korea as Dokdo and in Japan as Takeshima.
The long-running row over the islands has affected ties between the two nations.
Both Japan and South Korea say they have long-standing historical ties to, and claims over, the island grouping.
The drill, which included destroyers and combat jets, took place on what South Korea has designated "Dokdo Day".
"It is a regular drill aimed at repealing non-military forces that approach Dokdo via a sea or air route," an unidentified military official told Yonhap news agency.
A defence ministry official said that it was important to show the area "would be defended by South Korea, in whatever circumstances".