South Korea and the U.S. carried out a four-day joint naval exercise in the East Sea (Sea of Japan) through Sunday, focusing in part on countering potential North Korean infiltration across the inter-Korean maritime border.

The drills, which began Thursday, included maritime counter-infiltration training aimed at deterring incursions by DPRK special operations forces, as well as joint anti-submarine warfare and integrated responses to multi-domain threats.

The drills involved approximately 10 South Korean vessels, including the Aegis destroyer ROKS Yulgok Yi I, submarines, P-3 maritime patrol aircraft, AW-159 helicopters and fighter jets such as the FA-50 and KF-16. The U.S. Navy