(ATTN: RECASTS headline, lead; ADDS details in paras 6-10)
SEOUL, Aug. 25 (Yonhap) -- The South Korean armed forces launched a two-day military exercise to defend the easternmost islets of Dokdo on Sunday amid growing tensions over trade and their shared history, in a show of its staunch defense stance against Japan's repeated sovereignty over the cluster of rocks in the East Sea.
The Navy announced that the drill involves Navy, Air Force and Army forces, such as naval warships and aircraft, as well as Army and Marine Corp troops.
The drills have been held twice a year, usually in June and December, to better fend off possible foreign infiltrations to the rocky outcroppings and the surrounding waters.
But this year's drills have been pushed back amid an escalating trade row with Japan stemming from differences over wartime forced labor. Japan, which has made territorial claims to Dokdo, has protested the drills.
"In consideration of the drill's significance and size, the military named it the 'East Sea territory defense exercise,' in order to further solidify its determination to defend the country's territories in the East Sea, including Dokdo," a Navy official said.
Seoul's military drills immediately drew protest from Tokyo, which repeated its sovereignty over the islets.
In a protest lodged through a diplomatic channel, Tokyo expressed its "deep regret" over the drill and "strongly urged" Seoul to stop the drill, saying the rocky islands, known as Takeshima in Japan, are "an integral part of the territory of Japan," according to Kyodo News Agency.
According to the Navy, the country's first Aegis-equipped destroyer, Sejong the Great, and nine other warships, along with 10 warplanes, including the F-15K, were deployed in the drills.
"Overall, the size of the armed forces doubled compared with previous levels," a Navy official said.
The Sejong the Great boasts the SPY-1D radar system capable of detecting and tracking 1,000 distant aerial targets simultaneously. With the system, the warship has detected North Korea's missile launches, including its first long-range rocket test in April 2009.
It is also equipped with an advanced fire control system, due to which the vessel was selected as a Top Gun ship during the fire support training of the U.S.-led multinational Rim of the Pacific exercise in 2010.
South Korea launched the Dokdo drills in 1986. Last year, the drills took place for two days in both June and December.
South Korea has maintained effective control of the nation's easternmost islets with a small police detachment since their liberation from Japanese colonial rule in 1945. Japan has persistently laid claim to Dokdo, drawing strong condemnation from the Seoul government.
Earlier this month, South Korea lodged a protest over Japan's marking of Dokdo as its territory on a map on the 2020 Tokyo Olympics website.
Seoul-Tokyo ties recently have plummeted to a fresh low after Japan dropped South Korea from the list of its trusted trading partners earlier this month following the announcement of tighter export curbs on July 4. In response, South Korea on Thursday announced its decision to terminate the military information-sharing pact with Japan.
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