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"The G20 leaders' summit opens a golden window of opportunity for establishing a good global governance for every global citizen," he said.

During his visit, Xi pointed out that China and the rest of the world will jointly seek development while a premise for such development is an environment of lasting peace.

In regard to the complex and grave regional security situation, Xi suggested the two countries boost security cooperation and jointly fight against threats of the "three evil forces" of terrorism, separatism and extremism, as well as transnational organized crime.

In a three-pronged proposal for future East Asian summitry, Li first called for faster regional economic integration so as to make East Asia a stable growth pole for the world economy.

The U.S. should be more open and transparent on the issue, said the spokeswoman.