PORT MORESBY, Nov. 17 (Xinhua) -- Chinese President Xi Jinping warned against the rising trend of protectionism and unilateralism here on Saturday.

As he delivered a keynote speech at the APEC CEO Summit in the capital of Papua New Guinea, Xi said that only openness and cooperation can bring more opportunities and create more space for development.

He called for firm efforts to safeguard the multilateral trading system with the World Trade Organization at its core.