A South Korean sailor uses a binoculars as South Korean warship sails during their three-day military drills in South Korea's East Sea on Feb. 6, 2013. (Associated Press/Korea Pool via Yonhap)

A South Korean sailor uses a binoculars as South Korean warship sails during their three-day military drills in South Korea's East Sea on Feb. 6, 2013. (Associated Press/Korea Pool via Yonhap)