China has called on the US to fulfill its “obligation” to allow Hong Kong Chief Executive John Lee to attend a summit in San Francisco this year, underscoring the difficulty of engaging with sanctioned officials.

HONG KONG (AP) — The life sentence imposed by China on a 78-year-old U.S. citizen, who was also a Hong Kong permanent resident, on spying charges shows the city should “stay vigilant” to security risks, its leader said Tuesday. Chief Executive John Lee answered none of the lingering questions about why John Shing-Wan Leung was prosecuted. The sentence was announced Monday but neither the Hong Kong government nor the court in the eastern Chinese...