Foreign Ministry spokesman Geng Shuang dismissed remarks from a senior EU official on Monday and urged the European Union to "distinguish right from wrong".

Geng was speaking at a daily news conference after EU diplomatic chief Federica Mogherini talked about the situation in Hong Kong on Friday.

The protests in Hong Kong have turned radical and violent, and have challenged the rule of law and order in Hong Kong, Geng said, adding they have seriously threatened the lives and property of Hong Kong residents, and have violated the red line of the "one country, two systems" principle.

"If such serious and violent crimes happened in Europe, I believe no European country would just sit and ignore them," he said.

The EU should understand and support the Hong Kong Special Administrative Region government in stopping violence according to law and maintaining Hong Kong's rule of law, prosperity and stability, Geng said.