China's President Xi Jinping has called for hastening efforts to make breakthroughs in core technologies, Reuters reported citing state media. Xi, while making a speech promoting the development of the Yangtze River economic belt, also reiterated the objective of modernising the Asian country's supply chains, developing advanced manufacturing and strategic emerging industries, the report added. The Chinese President's remarks come at a time when tensions with the U.S. are on the rise following planned technology curbs by the U.S. on the world's second largest economy. Xi noted that provinces and cities along the Yangtze River should take the responsibility for…