【明報專訊】WHILE the Sino-US trade negotiations are about to resume, Washington has made a new move. Using human-rights related problems arising in Xinjiang as a pretext, it has added to its trade blacklist eight Chinese technology companies including SenseTime, a Hong Kong enterprise specialising in facial recognition. It is difficult for Hong Kong to stay out of an increasingly bitter struggle between the two nations. On the one hand, Washington's decision highlights its strategic aim of undermining China's AI development. On the other, it signals that it is not easy for Hong Kong, being embroiled in a Sino-US war over technology, to be in favour with both.