Spokesman Wang Wenbin made the remarks at a press briefing when asked to comment on reports saying the United States plans to sell arms to Taiwan again.
Responding to the U.S. impulse and anxiety with calm and reason shows China's sense of responsibility, said Eduardo Regalado, a researcher at Cuba's Center for International Policy.
The United States has recently taken a number of provocative actions in the South China Sea, breaching its longstanding commitment of not taking sides, and blatantly interfering in the territorial disputes, Wang said.
National security legislation is also a common legal practice globally. Western countries including the United States and Britain have passed numerous laws in the field and have a large number of cases derived from judicial practices.
He said he has witnessed the development of U.S.-China relations over the past decades, which has brought tangible benefits to the two countries and their people.
In most cases, the so-called U.S. national security concerns are ordinary economic or trade disputes which can be reasonably solved through bilateral or multilateral negotiations. However, Washington is now obsessed with flexing its muscles, regardless of hurting partnerships or violating market principles and international norms.
Secondly, "our two countries, of course, are very different in terms of historical heritage, culture, economic development, and political system, and so on and so forth. These differences will be there, maybe for quite a long time to come," he said.
Such moves naturally gain little support, said Wang.
"I have been to China three times. China has a rich history and culture just as what Fiji does. Cultural exchange like today's visit will help us know better each other. Needless to say, we need to respect each other's history and culture and this will help us enjoy good relationship and cooperation," he said.
"China will not allow these people to get their way," said Wang.
When national security in Hong Kong is undermined and confronted with real threats and the HKSAR government had difficulty in completing national security legislation on its own, the Central Government took decisive measures to establish and improve at the state level a legal system and enforcement mechanisms to safeguard the national security in Hong Kong, he said.