korea's navy, coast guard and marinine corps troopsps sta the two-day drill on wednesday. military officials say thehey a practicing how to prevent illegal inincursions. south korerea's news agencncy she exercises involve some ten vessels. patrol aircraft and helicopters. it says the drill will serve as a strong warning to japan over its territorial claims. the south korean military conducts the drill twice a year. japanese officials protest it through diplomatic channels. they said the islands are an inherit part of japan's territory in terms of history and international law and they maintain south korea is illegally occupying them. >>> u.s. officials lodged an official complaint with beijing over what they call dangerous behavior by chinese military jets. they say a chinese fighter plane conducted an unsafe intercept of u.s. air force aircraft over the east china sea. the u.s. air force rc-135 reconnaissance plane was flying in international airspace on tuesday when two chinese j-10 fighter jets intercepted it. u.s. pacific command officials describe one of the jets as flying at an unsafe, excessive right of closure. they did not disclose the exact location of the incident. they a