China needs to brace for a "digital cold war" with the United States as the two nations go head-to-head for dominance of the internet economy. The warning from a top Chinese think tank analyst comes amid heightened technological rivalry between the world's two largest economies and not long after Beijing unveiled a blueprint to ramp up China's tech capabilities by 2025. "The US has adopted a 'small yard, high fence' strategy to suppress China with a whole-of-government approach," said Zhang Monan, chief researcher with the US-Europe Institute at the China Centre for International Economic Exchanges (CCIEE). Do you have questions…