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China's enactment of a national security law for Hong Kong has triggered concern overseas and a firm defence at home.

China says the law is necessary to deal with separatism and foreign interference in the semi-autonomous territory, but critics say it will outlaw dissent and destroy the autonomy promised when Britain handed the territory to Beijing in 1997 under a "one country, two systems" framework.

Here's a roundup of reactions to the law's passage.