US citizen's life sentence in China highlights national security concerns

TL;DR
Hong Kong's Chief Executive John Lee has warned the city to "stay vigilant" to security risks after China sentenced a 78-year-old US citizen and Hong Kong permanent resident to life in prison on spying charges. The Hong Kong government and the court in Suzhou that tried John Shing-Wan Leung have not released details of the charges. Leung's sentencing threatens to further exacerbate already strained ties between Beijing and Washington.
- Hong Kong leader says China's sentencing of US citizen exposes national security threats The Associated Press
- China sentences US citizen to life in prison on spying charges CNN
- Hong Kong leader says China's sentencing of US citizen exposes national security threats Yahoo News
- China sentences US citizen, 78, to life in prison for spying – BBC News BBC News
- American jailed for spying by China is a veteran pro-Beijing advocate who rubbed shoulders with senior Chinese officials, CNN reporting shows CNN
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