Vice-Premier Han Zheng on Wednesday called on China and Singapore to boost the quality and level of cooperation in various fields, including epidemic response and green development. Han made the remarks in a video talk with his Singaporean counterpart Heng Swee Keat. As close neighbors and partners, China and Singapore have maintained close high-level exchanges and enjoyed mutual political trust, Han said. The latest interaction between the top leaders of the two countries took place in Octob...