Yang Tengbo, a 50-year-old Chinese businessman, has been banned from the UK due to allegations of espionage and his connections to Prince Andrew. UK authorities claim he formed a significant trust with the prince and developed relationships with politicians for potential leverage by China. After a lengthy legal battle, a tribunal upheld the ban citing security risks, while Yang denies any wrongdoing and plans to appeal. The allegations include links to the United Front Work Department, a covert Chinese government department.