Chinese foreign ministry Friday slammed a UK report that claimed Hong Kong, a region under British colonial rule for nearly a century, has become less free since its return to China.

Since Hong Kong's return, the "one country, two systems" practice has gained great achievements, which could not be denied by any objective and unbiased observer, Chinese foreign ministry spokesperson Hua Chunying said on Friday's press conference in Beijing.

Hua made the remarks after the UK parliament's foreign affairs committee released a report on Thursday saying Hong Kong is facing a "crisis of governance" and its high degree of autonomy from China is being "eroded."

The report also said that UK lawmakers should take a tougher stance over Hong Kong. Hua slammed the idea and said that Hong Kong affairs are Chinese domestic affairs and the UK has no right to interfere and it bears no "obligation" over Hong Kong.

A Xinhua commentary titled "An absurd Hong Kong report by UK MPs" read on Friday that the UK report wording shows that these British MPs are hostile to Hong Kong's development and are still laboring under a colonial mindset.

"They imply in it that the Hong Kong people would rather their government be loyal to the United Kingdom and that the region should follow instructions from politicians of its former ruler," the commentary said.

According to Radio Television Hong Kong, Zhang Dejiang, Chairman of the National People's Congress (NPC), warned against anyone who advocates "Hong Kong separatism" on Friday at a group meeting of the ongoing annual session of the 12th NPC.

Fan Hsu Lai-tai, an NPC deputy, quoted Zhang as saying that three new problems popped up in Hong Kong last year, including the opposition to the decision on 2017 chief executive election passed by the NPC standing Committee last August and the movement to seek "independence" led by "a small group of people."

Occupy protesters took streets last year asking for public nomination in the 2017 election.