TAICHUNG, Taiwan—Taiwan’s air, sea, and land forces conducted live-fire exercises simulating the repulsion of an invading force on Thursday, with President Tsai Ing-wen saying it showed their determination to defend the democratic and Chinese-claimed island.F-16 and domestically made Ching-kuo fighter jets launched strikes and tanks raced across inland scrub, firing shells to destroy targets on the beach. About 8,000 personnel took part in drills, held on a coastal strip near Taichung in central Taiwan.The drills, dubbed “Han Kuang,†are Taiwan’s main annual exercises. This year’s come as China has stepped up its military activity around the island, including flying...