WASHINGTON D.C., April 1, 2016 (Xinhua) -- China's Vice Foreign Minister Zheng Zeguang (C) speaks during a media briefing after the summit between Chinese President Xi Jinping and his U.S. counterpart Barack Obama in Washington D.C., the United States, March 31, 2016. China's Vice Foreign Minister Zheng Zeguang told a media briefing after the Xi-Obama summit that the meeting was "positive, constructive and fruitful." (Xinhua/Bao Dandan)