Hong Kong’s national security laws must be constantly improved to address risks and close loopholes amid geopolitical tensions, a former senior mainland Chinese official overseeing the city’s affairs has said, while insisting that the local pieces of legislation were less draconian compared with equivalent laws in the United States and United Kingdom. Wang Zhenmin, former bureau chief of the State Council’s Hong Kong and Macau Office (HKMAO), was among the mainland legal experts who spoke at a...