REUTERS/Tyrone Siu Taiwan simulated repelling an invading force on Thursday and used civilian-operated drones for the first time as part of annual military drills on the self-ruled island amid escalating tensions with China. China claims self-ruled Taiwan as its sacred territory, under its "one China" policy, and Beijing has never renounced the use of force to bring what it sees as a wayward province under its control. China's air force has conducted a series of military maneuvers near the island in recent months that Taipei has denounced as intimidation. TAICHUNG, Taiwan (Reuters) - Taiwan simulated repelling an invading force on Thursday and used civilian-operated drones for the first time as part of annual military drills on the self-ruled island amid escalating tensions with China. The drills were presided over by Taiwan President Tsai Ing-wen and watched by the visiting king of eSwatini, the African kingdom formerly known as Swaziland at the center of a diplomatic tug-of-war between Taiwan and China.See the rest of the story at Business InsiderNOW WATCH: Why it's so hard for millennials to buy homesSee Also:The US may sail a warship around Taiwan in an attempt to back up ChinaIndia is pushing to be a bigger player in Southeast Asia, and it's a clear challenge to ChinaJim Mattis rebukes China's 'intimidation and coercion' in South China Sea, leaves room for a 'results oriented relationship'