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HONG KONG (AP) - Chinese President Xi Jinping on Saturday said any activities in Hong Kong seen as threatening China's sovereignty and stability would be "absolutely impermissible," employing some of his harshest language yet toward pro-democracy activities in the territory.

In a speech marking 20 years since the city became a semi-autonomous Chinese region after its handover from Britain, Xi pledged Beijing's support for the "one country, two systems" blueprint, under which Hong Kong controls many of its own affairs and retains civil liberties including free speech.

However, he said Hong Kong had to do more to shore up security and boost patriotic education, in a veiled reference to legislation long-delayed by popular opposition.

Chinese President Xi Jinping, right, shakes hands with Hong Kong's new Chief Executive Carrie Lam after Xi administered the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong, Saturday, July 1, 2017. (AP Photo/Kin Cheung)

And he appeared to put on notice a new wave of activists pushing for more autonomy or even independence, saying challenges to the power of China's central government and Hong Kong's leaders wouldn't be tolerated.

Any attempt to challenge China's sovereignty, security and government authority or use Hong Kong to "carry out infiltration and sabotage activities against the mainland is an act that crosses the red line, and is absolutely impermissible," Xi said.

Hong Kong has been roiled by political turmoil in recent years that brought tens of thousands of protesters onto the streets in 2014 demanding democratic reforms. Those calls were ignored by Beijing and Xi indicated there would be no giving ground in the future.

"Making everything political or deliberately creating differences and provoking confrontations will not resolve the problems," he said. Hong Kong "cannot afford to be torn apart by reckless moves or internal rifts."

While former colonial master Britain and other Western democracies have expressed concerns about Beijing's actions in Hong Kong, China has increasingly made clear it brooks no outside criticism or attempts at intervention.

Xi said China had made it "categorically clear" in talks with Britain in the 1980s that "sovereignty is not for negotiation."

"Now that Hong Kong has returned to China, it is all the more important for us to firmly uphold China's sovereignty, security and development interests," he said.

Chinese foreign ministry spokesman Lu Kang sent a similar message in Beijing on Friday, saying Hong Kong was strictly China's domestic affair.

The 1984 Sino-British Joint Declaration laying out terms for Hong Kong's return to Chinese rule is "no longer relevant today, and has no binding force on the Chinese central government's governance over Hong Kong," Lu said.

"The U.K. has no sovereignty, governance right or the right of supervision over today's Hong Kong. We hope the relevant people can be aware of the reality," Lu said.

Earlier, Xi presided over a swearing-in ceremony for Carlie Lam, Hong Kong's fifth chief executive since 1997. The life-long bureaucrat and her Cabinet swore to serve China and Hong Kong and to uphold the Basic Law, the territory's mini-constitution.

In a speech that ran far shorter than Xi's 32-minute address, Lam reviewed the dynamic financial center's achievements and challenges, pledged to support central government initiatives and declared that "the future is bright."

Lam prevailed over a much more popular rival in an election decried by many as fundamentally undemocratic, with only a sliver of a percent of Hong Kong's more than 3 million registered voters taking part.

Xi was due to return to Beijing midday Saturday. His three-day visit aimed at stirring Chinese patriotism had prompted a massive police presence and also included a visit to the People's Liberation Army garrison, which usually maintains a low profile in the territory.

Ahead of a flag raising ceremony Sunday, a small group of activists linked to the pro-democracy opposition sought to march on the venue carrying a replica coffin symbolizing the death of the territory's civil liberties. They were swiftly stopped by police and Chinese flag-waving counter protesters, with the action ending about an hour later.

Xi's remarks will likely fuel fears among critics that Beijing's ruling Communist Party is tightening its grip over the city's political and civil affairs following a string of recent incidents.

Those include the abductions of five Hong Kong booksellers to the mainland starting in late 2015 for selling gossipy titles about elite Chinese politics to Chinese readers. One of the men, Gui Minhai, is still being held.

In a similar case, a Chinese-born tycoon with a Canadian passport went missing earlier this year from his hotel suite. News reports indicated mainland Chinese security agents operating in Hong Kong abducted him - a step that would violate the Basic Law.

A plan to station Chinese immigration officers in a high-speed rail terminal under construction has also raised hackles, along with the establishment of a local branch of Beijing's Palace Museum without public consultation.

Concerns are also high over the two long-delayed policies Xi referenced in his speech: the so-called patriotic national education in schools that many parents fear is a cover for pro-Communist brainwashing, and the anti-subversion national security legislation.

Inflows of "red capital" from mainland property investors and businesses are also seen as leaving indigenous tycoons at a disadvantage, while further inflating housing prices that make Hong Kong one of the world's most unequal places.

Pro-democracy lawmaker Leung Kwok-hung and other activists carry a replica of a casket with the word meaning "Respect for the dead" as they try to march to the venue where official ceremonies are held to mark the 20th anniversary of Chinese rule over Hong Kong in Hong Kong, Saturday, July 1, 2017. Chinese President Xi Jinping's three-day visit aimed at stirring Chinese patriotism in the former British colony people has promoted a massive police presence. (AP Photo/Ng Han Guan)

A pro-democracy activist is taken way by police after the group's march clashed with pro-China counter protesters blocked their way to where official ceremonies are held to mark the 20th anniversary of Chinese rule over Hong Kong in Hong Kong, Saturday, July 1, 2017. Chinese President Xi Jinping's three-day visit aimed at stirring Chinese patriotism in the former British colony people has promoted a massive police presence. (AP Photo/Ng Han Guan)

Chinese President Xi Jinping speaks after administering the oath for the Hong Kong's new Chief Executive Carrie Lam at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chief Executive-elect Carrie Lam, center in red, and other Hong Kong officials attend the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Chinese President Xi Jinping, left, and Hong Kong's new Chief Executive Carrie Lam leave after administering the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center dia chi mua chan ga goi hanvico in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Hong Kong Chief Executive-elect Carrie Lam, right, walks with her husband Lam Siu-por as she waves to guests before attending the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Chief executive-elect Carrie Lam wipes her eyes as Chief Executive Leung Chun-ying, right, and her husband Lam Siu-por, center, stand during the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Chinese President Xi Jinping, right, looks at Hong Kong's new Chief Executive Carrie Lam after administering the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, administers the oath to Hong Kong's new Chief Executive Carrie Lam for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Hong Kong Chief Executive-elect Carrie Lam, center in red, and other Hong Kong officials attend the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

A Chinese national flag is displayed before Chinese President Xi Jinping administers the oath to Hong Kong's new Chief Executive Carrie Lam for a five-year term in office at the Hong ruột gối hanvico hà nội Kong Convention and Exhibition Center Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, and Hong Kong's new Chief Executive Carrie Lam gesture after administered the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center, Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, and Hong Kong's new Chief Executive Carrie Lam leave after administering the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Hong Kong Chief Executive-elect Carrie Lam, center, leaves after attending the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Chinese President Xi Jinping, right, and Hong Kong's new Chief Executive Carrie Lam leave after administering the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, and Hong Kong's new Chief Executive Carrie Lam leave after administering the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Hong Kong Chief Executive-elect Carrie Lam, center, shares a light moment with former Chief Executive Tung Chee-hwa, left, as Lam's husband Lam Siu-por, right, stands during the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Chinese President Xi Jinping, right, administers the oath to Hong Kong's new Chief Executive Carrie Lam's new cabinet in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

From left in front, Director of Chinese central government's Liaison Office in Hong Kong Zhang Xiaoming, former Hong Kong Chief Executive Tung Chee-hwa, Chief Executive-elect Carrie Lam, her husband Lam Siu-por, Hong Kong Chief Executive Leung Chun-ying attend the flag raising ceremony to mark the 20th anniversary of the Hong Kong handover to China in Hong Kong, Saturday, July 1, 2017. (AP Photo/Vincent Yu)

Pro-democracy activists, top and bottom, react as they are taken away by Hong Kong police officers after clashes with pro-China counter protesters blocking their way in Hong Kong, Saturday, July 1, 2017. Chinese President Xi Jinping's three-day visit aimed at stirring Chinese patriotism in the former British colony people has promoted a massive police presence. (AP Photo/Ng Han Guan)

Chinese President Xi Jinping, right, poses with Hong Kong's new Chief Executive Carrie Lam after Xi administered the oath for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, administers the oath to Hong Kong's new Chief Executive Carrie Lam for a five-year term in office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)

Chinese President Xi Jinping, right, poses with Hong Kong's new Chief Executive Carrie Lam for a photo after Xi administered the oath for a five-year term in mua dem bong ep hanvico office at the Hong Kong Convention and Exhibition Center in Hong Kong Saturday, July 1, 2017. (AP Photo/Kin Cheung)