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YINCHUAN, Sept. 5 (Xinhua) -- The fourth China-Arab States Expo opened Thursday in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, focusing on economic, trade, science and technology cooperation.

For over 3,000 years, some major dynasties in Chinese history built their capitals in the river basin, making the region the centers of politics, economy and culture in the country.

The behaviors of the radical protesters gravely breached the public peace and posed a serious threat to the safety of police officers on duty and members of the public at the scene, it said.

He called on the three sides to strengthen cooperation in the fields of science and technology, big data, artificial intelligence and 5G, expressing hope that the ROK and Japan provide a fair, non-discriminatory and predictable business environment for enterprises from all over the world.

Wang stressed the determination to implement the "one country, two systems" principle, act in strict compliance with the Constitution and the basic laws, support the law-based governance of the chief executives and the special administrative region governments, safeguard national sovereignty, security and development interests, and maintain long-term prosperity and stability in Hong Kong and Macao.