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Hong Kong's new Chief Executive Carrie Lam (L) shakes hands with China's President Xi Jinping (R) after being sworn in as the territory's new leader at the Hong Kong Convention and Exhibition Centre in Hong Kong on July 1, 2017.
Lam became Hong Kong's new leader on July 1, which marks the culmination of the lifelong civil servant's career as she inherits a divided city fearful of China's encroaching influence.  / AFP PHOTO / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
Hong Kong's new Chief Executive Carrie Lam (L) shakes hands with China's President Xi Jinping (R) after being sworn in as the territory's new leader at the Hong Kong Convention and Exhibition Centre in Hong Kong on July 1, 2017.
Lam became Hong Kong's new leader on July 1, which marks the culmination of the lifelong civil servant's career as she inherits a divided city fearful of China's encroaching influence.  / AFP PHOTO / Anthony WALLACE        (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

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    China's President issues 'red line' warning

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China's President issues 'red line' warning

China's President Xi Jinping has warned that any efforts in Hong Kong "to challenge the power" of Beijing are "absolutely impermissible," as the former British colony marked 20 years of Chinese rule Saturday.

China's President issues 'red line' warning

China's President Xi Jinping has warned that any efforts in Hong Kong "to challenge the power" of Beijing are "absolutely impermissible," as the former British colony marked 20 years of Chinese rule Saturday.