China, a major power with the world's numerically largest navy, could adopt a nuclear-powered design for its next aircraft carrier as the military giant extends its reach in the Pacific, analysts say. The Pentagon believes China operates over 370 naval ships and submarines , including three aircraft carriers. The third and most advanced, the CNS Fujian , was officially put into service in early November at a ceremony attended by President Xi Jinping, whose aim is to build a "world-class"