Rising U.S.-China trade tensions are raising alarm bells in export-reliant Singapore, with an index measuring economic uncertainty climbing to a five-month high in March to 155 from 126 a month before. Prime Minister Lee Hsien Long said on Tuesday that Singapore does not believe that unilateral tariffs is the correct solution as they are not compliant with World Trade Organization (WTO) rules. Lee also said that China has responded to United States’ trade salvos accordingly and is “careful and calibrated”. Also on Tuesday, Chinese President Xi Jinping announced plans to open up the Chinese economy, including lowering tariffs for autos and other products and enforcing the legal intellectual property of foreign firms.