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WASHINGTON, Sept. 21 (Xinhua) -- On the eve of the upcoming state visit to the United States by Chinese President Xi Jinping, a top American foreign policy official vowed Monday that the U.S.-China relationship is not a zero-sum game, as the U.S. is "steadily and methodically expanding the breadth and depth of our cooperation with China."

"The motivation [behind] the arbitration is not to settle disputes, but an attempt to negate China's territorial sovereignty and maritime rights and interests in the South China Sea for its own sake." Liu said.

He will also meet U.S. parliament leaders and attend a welcoming luncheon held by Vice President Joe Biden and Secretary of State John Kerry.

Xi left Beijing Tuesday afternoon for his first state visit to the United States and attendance at a series of UN summits from Sept. 22 to 28.

He said the central government will continue its policies of "one country, two systems", "Hong Kong and Macao people administering their own affairs" and "high degree of autonomy" in Hong Kong and Macao while supporting adherence to basic law to support long-term prosperity there.