Chinese President Xi Jinping pledged Wednesday to open the country’s market further, apparently criticizing the United States for sticking to unilateralism and protectionism on trade.”We should not be self-centered. We oppose unilateralism and protectionism,” Xi said in a video speech at the opening ceremony of the third annual China International Import Expo in Shanghai.Xi also emphasized that China will speed up negotiations on a free trade agreement with neighbors Japan and South Korea, and work for an early signing of the 16-member Regional Comprehensive Economic Partnership framework.At i…