China’s first aircraft carrier emerged from the mist in the waters south of Hong Kong on Friday morning as a four-warship flotilla gave a potent demonstration of Beijing’s might. The carrier, christened the Liaoning after the north-eastern Chinese province, sailed past half a dozen hulking container ships as it entered Hong Kong waters at about 7.30am. The ship’s maiden visit to Hong Kong came less than a week after the Chinese president, Xi Jinping, toured the city, warning the former British colony must not become a launchpad for challenges to Beijing’s authority.